FlxAssetPaths: fix filterExtensions for files with multiple dots #2107
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Currently, getFileReferences filtered extensions using the first string after a dot. This means that myfile.png.old is included even when a filter is set to only import png files. This causes various compiler errors when tortoisesvn is used, due to duplicate file.ext.svn-base files being added.
New implementation takes the last string after a dot, meaning that myfile.png.old is treated as a .old file and will not be included if "old" is not on the filter list.