Add support for baking .yui files into the gml code to support non-desktop platforms

[shdwcat]

HTML5 etc can't use file_find_etc -- possible solution is to have the system load all the .yui files into their raw structs and then write out GML files with all the data in them in gml struct syntax. Then we need a way for Cabinet to be able to intercept 'file' requests and return the baked in data instead.