Fix how listeners are initialized
Fix how the screen is updated
Use update-fn! instead of swap!
Clear the physics world during REPL development
Don't remove entities/world when disposing the world
Simplify wording about using declare
Change order of conditionals
Update LibGDX and increment template version number
Increment version number
Start 0.3.7-SNAPSHOT
Fix argument order
Make add-timer! return nil
Revert change to the add-timer! function