[BUG #8471] removed Interface.isDefined
[BUG #8471] removed Array/Date/Object polyfills
[BUG #8471] added interface support to qx.Bootstrap
[BUG #8471] removed Array/Date/Object polyfills
[BUG #8471] removed Function polyfill
[BUG #8471] removed Array/Date/Object polyfills
[BUG #8471] initial support for mixins in qx.Bootstrap