Enable depth test for sprites
Make people walk on top of the world
Include negative height map values
Style fix
Add updated world data
Load level data
Implement basic hit testing
Implement more of the trace function
Expand trace algorithm
Finish edge tracing function
Remove trace sprites
Add collision responses against the borders
Add scripting
Clean up script class
Add virtual machine
Spawn characters from script
Regain control of the player
Test for hit with action button
Trigger interaction scripts
Implement SAY opcode