Pre-released custom fix for alphaTab

This pre-release contains 3 fixes:

1. Fix detectScriptFile for ES6 module compatibility.
2. Strengthen alphatex font style to avoid style being overwritten.
3. Make this github repo installable via npm install by fixing pakcage.json and rollup.config.js

Usage

npm install yshlin/alphaTab#v1.3.0.a