update from oil 0.18 to 0.19

Fairly clean, but for some reason the build/dev.sh "all"
build pattern was broken and I needed to change to directly
use build/py.sh "all". Also a param rename.

nixpkgs/oildev.nix

@@ -62,8 +62,8 @@ rec {
     src = fetchFromGitHub {
       owner = "oilshell";
       repo = "oil";
-      # rev == present HEAD of release/0.18.0
-      rev = "bd7ba38a2c04459cf21352b4ba60da3c334c40b1";
+      # rev == present HEAD of release/0.19.0
+      rev = "4d56470f97da2f55f33ad9e4d89d103c3b9436ee";
       hash = "sha256-TODO-via-fixup";
 
       /*
@@ -110,7 +110,7 @@ rec {
     doCheck = true;
 
     preBuild = ''
-      build/dev.sh all
+      build/py.sh all
     '';
 
     postPatch = ''

resholve

@@ -4307,7 +4307,7 @@ class ResolvedScript(RecordCommandlike):
             arena=arena,
             parse_opts=optview.Parse(state.InitOpts(), NO_OPTIONS_OVERLAY),
             aliases={},  # dummy
-            oil_grammar=None,
+            ysh_grammar=None,
             one_pass_parse=True,
         )