(New Files) Implement possibility to add an external DiffTool in addi…

…tion to the FileDiff output in Sublime.

FileDiffs.sublime-settings

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+{
+
+	// just uncomment one of the examples
+	// or write your own command
+
+  // opendiff (FileMerge)
+  //"cmd": ["opendiff", "$file1", "$file2"]
+
+	// ksdiff (Kaleidoscope)
+	//"cmd": ["ksdiff", "$file1", "$file2"]
+
+}

Main.sublime-menu

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+[
+    {
+        "caption": "Preferences",
+        "mnemonic": "n",
+        "id": "preferences",
+        "children":
+        [
+            {
+                "caption": "Package Settings",
+                "mnemonic": "P",
+                "id": "package-settings",
+                "children":
+                [
+                    {
+                        "caption": "FileDiffs",
+                        "children":
+                        [
+                            { "command": "open_file", "args": {"file": "${packages}/FileDiffs/FileDiffs.sublime-settings"}, "caption": "Settings – Default" },
+                            { "command": "open_file", "args": {"file": "${packages}/User/FileDiffs.sublime-settings"}, "caption": "Settings – User" },
+                            { "caption": "-" }
+                        ]
+                    }
+                ]
+            }
+        ]
+    }
+]

package-metadata.json

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+{"url": "https://github.com/spape/SublimeFileDiffs", "version": "0.9", "description": "Shows diffs - also in an external diff tool - between the current file, or selection(s) in the current file, and clipboard, another file, or unsaved changes."}