0.5.0 - Boss Room Update

The most noticeable change in this version is the labyrinth exit, it has been re-jigged to allow the idea of creating a boss battle sequence.
Please do let me know how you feel about this change as it will effect the future development of this project in a large way :D

Changes to gameplay experience including;
- Player stats
- Spawning rates/probability
- Boss battle/Labyrinth exit
- Entity spawning

Tweaks & bug fixes:
- Menu switching
- Visual ordering
- UI

There are other changes not listed here which contain minor effects but help push the game in the direction of a smoother play experience.