Support syntax highlighting in _ren.py files

Add injection grammar for renpy comments in _ren.py files

For now this will only work in doc strings, python syntax highlighting isn't changed

examples/test_ren.py

@@ -0,0 +1,17 @@
+# This is not included in the game. It's here so that an editor knows
+# the type of strength.
+strength = 100
+
+"""renpy
+init python:
+"""
+
+class BoostStrength(Action):
+    """
+    Boosts the strength of the player by 10.
+    """
+
+    def __call__(self):
+        global strength
+        strength += 10
+        renpy.restart_interaction()

package.json

@@ -36,7 +36,8 @@
   },
   "activationEvents": [
     "onLanguage:renpy",
-    "workspaceContains:**/*.rpy"
+    "workspaceContains:**/*.rpy",
+    "workspaceContains:**/_ren.py"
   ],
   "main": "./dist/extension",
   "browser": "./dist/extension.js",
@@ -46,7 +47,8 @@
         "id": "renpy",
         "aliases": [
           "Ren'Py",
-          "renpy"
+          "renpy",
+          "rpy"
         ],
         "extensions": [
           ".rpy",
@@ -88,6 +90,16 @@
         "scopeName": "source.renpy.python",
         "path": "./syntaxes/renpy.python.tmLanguage.json"
       },
+      {
+        "scopeName": "renpy.comment.injection",
+        "path": "./syntaxes/injection.json",
+        "injectTo": [
+          "source.python"
+        ],
+        "embeddedLanguages": {
+          "meta.embedded.renpy": "renpy"
+        }
+      },
       {
         "language": "renpy-log",
         "scopeName": "text.renpy-log",

syntaxes/injection.json

@@ -0,0 +1,26 @@
+{
+  "scopeName": "renpy.comment.injection",
+  "injectionSelector": "L:string.quoted.docstring",
+  "patterns": [
+    {
+      "include": "#renpy-source"
+    }
+  ],
+  "repository": {
+    "renpy-source": {
+      "contentName": "meta.embedded.renpy",
+      "begin": "(?<=^\\\"\\\"\\\")renpy",
+      "beginCaptures": {
+        "0": {
+          "name": "keyword.renpy"
+        }
+      },
+      "end": "(?=^\\\"\\\"\\\")",
+      "patterns": [
+        {
+          "include": "source.renpy"
+        }
+      ]
+    }
+  }
+}