Umbra_ v0.2-b

Major update:

- Support for MacOS!

   - Mac with Intel and Apple silicon

- Added a new mob - Porcupine! [The porcupine is similar to the slime but much more aggressive. It shoots sharp spikes at the player at a fast rate.]

  - Damage: 5

  - Health: 15

  - Spike speed: 9

  - Move speed: 1

  - EXP reward: 3

- Changed up wave system:

  - Mob exp rewards increase each wave

  - Higher level gives player health and mana boosts and coin rewards

  - Completing waves increases max health and mana and gives coin rewards

- Fixed some bugs and reduced code length

- Improved dungeon generation times and further optimized the game