Block support

[Secret-chest]

Support Scratch blocks. More will be added when these are about to be finished.

Note: Rotation is rendered but blocks using it are not supported, so no linked issue.

• [x] when flag clicked
• [x] set x/y
• [x] change x/y
• [x] go to x, y
• [x] x position (nneds #5)
• [x] y position (needs #5)
• [x] point in direction
• [x] point towards mouse
• [ ] point towards sprite
• [x] turn left
• [x] turn right
• [x] direction (needs #5)
• [x] go to mouse
• [x] mouse x (needs #5)
• [x] mouse y (needs #5)
• [x] wait seconds
• [x] wait until
• [ ] go to sprite
• [x] when key pressed (needs #7)
• [ ] key pressed? (needs #7, #5)
• [x] if then
• [x] if then else
• [ ] repeat until
• [x] repeat
• [x] forever
• [ ] set size
• [ ] change size
• [ ] variable (needs #5, #6)
• [ ] set variable (needs #6)
• [ ] change variable (needs #6)
• [ ] touching? (needs #5)
• [ ] touching color? (needs #5)
• [x] equals (needs #5)
• [x] greater than (needs #5)
• [x] less than (needs #5)
• [x] + (needs #5)
• [x] - (needs #5)
• [x] * (needs #5)
• [x] / (needs #5)
• [ ] mod (needs #5)
• [x] random (needs #5)
• [x] go to random