Build 25715804

Spikes on walls and ceilings
In the level editor, spikes can now sit on walls and ceilings as well as on the ground. Press Tab (X on a controller) to turn them. Removing a block also removes the spikes fixed to it.
Spikes and spike pits now behave differently:
- Stones fill pits, never spikes.
- The shovel can't dig a block that holds spikes.

Clearer texts
- The spring's hover text now says what it does from a wall too: "Throws them the way it faces."
- The spikes' hover text is "Spikes. Hurts. Don't break."
- Level 11's tip now explains the sprint sign better: "A turn sign facing the way they already walk makes them run faster for three blocks. A running start goes further."