Add injection grammars for fenced markdown blocks

See https://github.com/mjbvz/vscode-fenced-code-block-grammar-injection-example

helper/haxe-markdown.YAML-tmLanguage

@@ -0,0 +1,14 @@
+injectionSelector: L:markup.fenced_code.block.markdown
+patterns:
+- include: '#haxe-code-block'
+repository:
+  haxe-code-block:
+    begin: haxe(\s+[^`~]*)?$
+    end: (^|\G)(?=\s*[`~]{3,}\s*$)
+    patterns:
+    - begin: (^|\G)(\s*)(.*)
+      while: (^|\G)(?!\s*([`~]{3,})\s*$)
+      contentName: meta.embedded.block.haxe
+      patterns:
+      - include: source.hx
+scopeName: markdown.haxe.codeblock

helper/haxe-markdown.tmLanguage

@@ -0,0 +1 @@
+<?xml version="1.0" encoding="UTF-8"?><!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd"><plist><dict><key>injectionSelector</key><string>L:markup.fenced_code.block.markdown</string><key>scopeName</key><string>markdown.haxe.codeblock</string><key>repository</key><dict><key>haxe-code-block</key><dict><key>end</key><string>(^|\G)(?=\s*[`~]{3,}\s*$)</string><key>begin</key><string>haxe(\s+[^`~]*)?$</string><key>patterns</key><array><dict><key>while</key><string>(^|\G)(?!\s*([`~]{3,})\s*$)</string><key>contentName</key><string>meta.embedded.block.haxe</string><key>begin</key><string>(^|\G)(\s*)(.*)</string><key>patterns</key><array><dict><key>include</key><string>source.hx</string></dict></array></dict></array></dict></dict><key>patterns</key><array><dict><key>include</key><string>#haxe-code-block</string></dict></array></dict></plist>

helper/hxml-markdown.YAML-tmLanguage

@@ -0,0 +1,14 @@
+injectionSelector: L:markup.fenced_code.block.markdown
+patterns:
+- include: '#hxml-code-block'
+repository:
+  hxml-code-block:
+    begin: hxml(\s+[^`~]*)?$
+    end: (^|\G)(?=\s*[`~]{3,}\s*$)
+    patterns:
+    - begin: (^|\G)(\s*)(.*)
+      while: (^|\G)(?!\s*([`~]{3,})\s*$)
+      contentName: meta.embedded.block.hxml
+      patterns:
+      - include: source.hxml
+scopeName: markdown.hxml.codeblock

helper/hxml-markdown.tmLanguage

@@ -0,0 +1 @@
+<?xml version="1.0" encoding="UTF-8"?><!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd"><plist><dict><key>injectionSelector</key><string>L:markup.fenced_code.block.markdown</string><key>scopeName</key><string>markdown.hxml.codeblock</string><key>repository</key><dict><key>hxml-code-block</key><dict><key>end</key><string>(^|\G)(?=\s*[`~]{3,}\s*$)</string><key>begin</key><string>hxml(\s+[^`~]*)?$</string><key>patterns</key><array><dict><key>while</key><string>(^|\G)(?!\s*([`~]{3,})\s*$)</string><key>contentName</key><string>meta.embedded.block.hxml</string><key>begin</key><string>(^|\G)(\s*)(.*)</string><key>patterns</key><array><dict><key>include</key><string>source.hxml</string></dict></array></dict></array></dict></dict><key>patterns</key><array><dict><key>include</key><string>#hxml-code-block</string></dict></array></dict></plist>

src/Converter.hx

@@ -3,9 +3,14 @@ import sys.io.File;
 class Converter {
     static function main() {
         Sys.print("Converting syntax files to plist...");
+
         convert("haxe.YAML-tmLanguage", "haxe.tmLanguage");
-        convert("haxe-hover.YAML-tmLanguage", "haxe-hover.tmLanguage");
         convert("hxml.YAML-tmLanguage", "hxml.tmLanguage");
+
+        convert("helper/haxe-hover.YAML-tmLanguage", "helper/haxe-hover.tmLanguage");
+        convert("helper/haxe-markdown.YAML-tmLanguage", "helper/haxe-markdown.tmLanguage");
+        convert("helper/hxml-markdown.YAML-tmLanguage", "helper/hxml-markdown.tmLanguage");
+
         Sys.println(" Done.\n ");
     }