private void removeDuplicateDrawables(FileHandle handle) {
        removeDuplicateDrawables(handle, true);
    }
Removes any duplicate drawables that share the same file name. This
ignores the file extension and also deletes TintedDrawables from the
same file. Calls removeDuplicateDrawables(handle, true).
@param handle
core/src/com/ray3k/skincomposer/dialog/DialogDrawables.java