Spawn stuff during gameplay
Merge branch 'jonesguy14/master'
Set sprite image before drawing
Merge branch 'kylelin47/image_update'
DeathError clears window, rotation of sprites changed
Merge branch 'kylelin47/DeathError'
Cease storing location on Entity; fix spawn_random()

The World used to keep an Entity's location on the Entity itself, for
convenience. Now it doesn't. This is less efficient but also less
complicated.

spawn_random() used to crash if there were no available locations. Now
it doesn't.
Simplify image handling for Entities
Merge branch 'kalgynirae/misc-cleanup'
Make Location __qualname__ more accurate
Add sprites to a batch for apparently faster drawing
Merge branch 'kalgynirae/sprites-in-a-batch'