v0.3.0 -- New enemy, AI rework

A lot of under-the-hood work on this build!

• The enemy AI is completely revamped as a finite state machine. It should still behave mostly the same, but it is much easier to manage.
• Enemies now have a death animation.
• Added a new enemy: a summoner who spawns slimes around you. Right now it's just a recolor of the standard "caster" enemy but I plan to give it new art eventually.
• Added 2 new floors that feature this enemy.
• Bombs now have a sound effect.
• The game has an "adults only" warning.
• Changed some of the dialogue in the final room.

There probably won't be any more updates in October, as I have some other hobbies I want to dedicate some time to. But who knows? Inspiration might strike.