JASS syntax highlighter

Tokenised in-browser by vscode-textmate + vscode-oniguruma — the engine VS Code uses — against syntaxes/jass.tmLanguage.json. The theme toggle previews VS Code (Light+/Dark+), GitHub (prettylights), Warcraft (parchment & gold), or TESH (the classic Trigger Editor Syntax Highlighter) colours. Drop a file anywhere on the editor to load it. Tab/Shift+Tab indent, Esc leaves the editor.