WARNING: The following files are generated by colorize.py:

block/repeating_command_block_back.png
block/chain_command_block_back.png
block/repeating_command_block_front.png
block/chain_command_block_front.png
block/repeating_command_block_side.png
block/chain_command_block_side.png
block/repeating_command_block_conditional.png
block/chain_command_block_conditional.png

(The files are in git to help the script know which files should exist)
