Renames avm-sandbox.js
Merge pull request #1556 from mbebenita/avx

Convert font height from twips.
Builds shaders into extension and iframe
Returning some extension preferences
Merge pull request #1557 from yurydelendik/shaders

Adds webgl, hub, turboMode preferences to the extension
Parse and load DefineFont4 data
Fix parsing clip events
Escape ampersands in html text
Adjust vertical position for text content
Align origin point when drawing static text
Support setting/updating the default text format
Relax font assertions
Fix parsing of strings
Merge pull request #1558 from tobytailor/master

Misc fixes
Don't enable shape caching by default until we have color transforms for drawImage.
Some Path2D fixes.
Call `_gotoFrame` instead of `gotoLabel` which does not exist.