Faster agentDestroy functions

v0.0.23

Bumped version to 0.0.23

Release 0.0.22

Lesson specific versions of agentDestroy() and hazardsRemain()
Counting fire hazards destroyed to determine success
No enums; two separate agentDetect functions, one for DeadBush and one for DryGrass

Blocks for Markdown tutorials

This release contains blocks that are needed for writing the tutorials with the MakeCode tutorial tool.

Release 0.0.20

v0.0.20

Bumping version to 0.0.20