clean up some user-defined features

most of them can be already found by a presence of a box, etc.
some of them is deprecated and there are no linked files

data/standard_features/14496-12/boxes.json

@@ -919,7 +919,7 @@
     },
     {
       "fourcc": "leva",
-      "description": "Leval assignment",
+      "description": "Level assignment box",
       "containers": ["mvex"],
       "type": "FullBox",
       "versions": [0],

data/standard_features/14496-12/user_defined.json

@@ -1,51 +1,31 @@
 {
   "64bit length": "Box(es) with 64-bit lengths (typically mdat)",
-  "implied length": "(size=0) Box with the length running to end of file (last box)",
-  "UUID box": "A user box using a UUID type (should be ignored if not recognized)",
-  "unknown box": "A box with an 'unknown' code is present in the file and should be ignored. The box type used for testing could be one of 'junk', 'mess', etc.",
-  "normal order": "(moov-mdat) Boxes in the 'usual' order for reading, and in the recommended order inside",
-  "late order": "(mdat first) The 'mdat' first and the 'moov' late, and boxes in the 'moov' in funny order.",
   "64bit headers": "There are 64-bit versions of the movie, track, and media headers, that allow long durations and dates after 2040.",
-  "track enabled flag": "The track-enabled flag in the track header.",
-  "edit list": "An edit list is used on at least one track, and some material in the media is edited out.",
+  "64bit chunks": "The 64-bit version of the chunk offset table is used, and the chunk offsets have non-zero bits in their upper 32 bits.",
+  "64bit fragments": "Fragments are used in combination with 64-bit offsets",
   "video track": "There is a video track with video headers",
   "audio track": "There is an audio track with audio headers",
+  "metadata track": "A timed metadata (or multiplexed timed metadata) track",
   "volumetric track": "There is a volumetric video track",
   "haptic track": "There is a haptic track",
-  "metadata track": "A timed meta-data track",
-  "unknown track": "An unknown type of track should be ignored (handler='junk' etc.)",
-  "unknown codec": "An unknown audio or video codec is used (sample entry name is 'junk' etc.)",
   "image track": "(no sync table) A track with a single image in it.",
-  "data reference": "Data reference atoms using URLs or URNs are used to refer to media in other files.",
-  "64bit chunks": "The 64-bit version of the chunk offset table is used, and the chunk offsets have non-zero bits in their upper 32 bits.",
-  "signed CTTS offsets": "",
-  "pad bits": "At least one track (audio, probably) has a padding bits table for non byte-lengthed Aus",
-  "degradation priority": "A degradation priority table is used (note that the meaning of the priority values is not established by standard).",
-  "Protected basic": "Basic protected streams (e.g. ISMA or OMA) are present",
-  "Protected IPMP": "Protected streams using the IPMP protection boxes are present",
-  "sample scale box": "The sample scale box (presenting video hint) is present",
-  "progressive download box": "The progressive download hitn box is present",
-  "Interleaved data": "The media data is interleaved on a sensible scale (e.g. .5 second) and in order",
+  "hint track": "This section tests hint tracks.",
+  "RTP hint tracks": "Regular RTP hint tracks are present. They should be ignored for local playback.",
+  "implied length": "(size=0) Box with the length running to end of file (last box)",
+  "unknown box": "A box with an 'unknown' code is present in the file and should be ignored. The box type used for testing could be one of 'junk', 'mess', etc.",
+  "late order": "(mdat first) The 'mdat' first and the 'moov' late, and boxes in the 'moov' in funny order.",
   "multiple mdats": "two or more mdat boxes are present",
-  "sample dependency": "The sample dependency table is present",
   "multiple sample descriptions": "There is one track ujsing several sample entries, not just one",
-  "Track groups": "Track groups are used",
-  "Sub-tracks": "Sub tracks",
-  "64bit fragments": "Fragments are used in combination with 64-bit offsets",
-  "Producer reference time": "",
-  "file level meta": "Meta box at file level",
-  "movie level meta": "Meta box at movie level",
-  "track level meta": "Meta box at track level",
-  "basic protected metadata": "Some meta-data is protected using the basic techniques",
-  "ipmp protected metadata": "Some meta-data is protected using IPMP boxes",
   "metadata references": "Some meta-data is in external files and linked by data references",
+  "sample dependency": "The sample dependency table is present",
+  "Interleaved data": "The media data is interleaved on a sensible scale (e.g. .5 second) and in order",
+  "pad bits": "At least one track (audio, probably) has a padding bits table for non byte-lengthed AUs",
   "item naming": "Some items use the item information (name etc.) box",
+  "Protected basic": "Basic protected streams (e.g. ISMA or OMA) are present",
+  "Protected IPMP": "Protected streams using the IPMP protection boxes are present",
+  "basic protected metadata": "Some meta-data is protected using the basic techniques",
+  "ipmp protected metadata": "Some meta-data is protected using IPMP boxes",
   "FD hint tracks": "",
-  "FEC reservoir": "",
-  "FD session group box": "",
-  "Group ID to name box": "",
-  "Hint tracks": "This section tests hint tracks.",
-  "RTP hint tracks": "Regular RTP hint tracks are present. They should be ignored for local playback.",
   "hint track setup": "Hint track headers etc. are present",
   "sdp boxes": "(moov and track) SDP information (in user-data) is present",
   "hint stats boxes": "Optional hint statistics are present",

data/standard_features/14496-15/user_defined.json

@@ -1,15 +1,9 @@
 {
-  "avc1 sample entry": "Simple AVC streams using parameter sets in the sample entry",
   "layering and subseq grps": "Sample groups are used for layering and sub-sequences",
   "switch tracks": "Tracks for switch pictures are present, with their track references",
   "separate param stream": "A separate parameter set stream is used.",
   "Extractors": "",
   "Aggregators": "",
   "Temporal Meta-data": "",
-  "Implicit Reconstruction": "",
-  "sbas track reference": "",
-  "scal track reference": "",
-  "oinf, linf and oref track reference": "",
-  "tbas and sabt track reference": "",
-  "hvc1 sample entry": ""
+  "Implicit Reconstruction": ""
 }