jshint: validthis local option instead of global
Merged proxyClass() and proxyInstance()

Also added a convenient function getHidden()
Added new core-module and interceptor-type

Added core-module "System.Comparators".
Added interceptor-type "partialModuleInterceptor".
Moved method addToURLList() from module to loader.
Minor fixes, renaming.
Replaced extension separator "|" with ","
Updated README