Luna Slimes

Improves Slimes and make them configurable.

Slimes can now merge and split, and have been visually upgraded.

All new gameplay and visual behavior can be configured.

Changes:

• animations are no longer locked to game's tick rate (fixed lerp)
• "anticipation" animation before jumping
• unique pixel-consistent textures based on slime's size
• new spawning animation
• new splitting animation, coupled with a new sound
• particles are emitted when splitting
• shadows scale based on squish amount
• slimes can merge with one another
• magma cubes use an entirely unique set of sounds
• config option for squash and stretch intensity