Remove stuff we've moved into kurt
Improve Block.stringify, move code to BlockType.stringify
scratch14 blocks, improve Block constructor
Indent stringify() blocks
Blocks: fix variable, list reporters
Fix Script class
Fix some scratch14 blocks
Fix scratch14 blocks: whenClicked, midiInstrument:, modulo, direction menus;
Remove Insert.similar_to
Color class; update todo
Start scratch20 script saving; scratch20 Color
scratch14 "when this sprite clicked" block
Clean up scratch14 blocks on save
Default 1x1 black costume
Insert('color') default value
Allow TranslatedBlockType arg to BlockType.get
Update todo
Start scratch20 reading
scratch14 blocks comments