scratch14: Categorise "when clicked" block
Clean up blocks2raw, todo files
Make color Insert default not random.
scratch14: Remove S14BlockType
scratch14: Remove construct.text based blockspecs parser
scratch14: Remove unneeded blocks_by_cmd
Minor cleanup
scratch14: Remove unused code
scratch14: Remove unneeded WatcherMorph defaults; remove unneeded bounds
scratch14: Remove unneeded functions: built, normalize, etc
scratch14: Move load_watcher, save_watcher to separate functions
scratch14: Move all conversion code to separate Serializer class
scratch14: Clean up some more, revert names of Stage, Sprite, Image, Sound
Update todo
scratch14: Remove BinaryFile; simplify WatcherMorph defaults
scratch14: Major rewrite of user objects and obj table; drop files.py