Convert font height from twips.

Previous font height hack was probably needed because of the improper handling of font resolution in define font.
Color transform polyfill, and some gradient fixes.
Comments.
Use hotpink as bad color code.
Address some of the review comments.
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