Quick patch to add option to adjust game's colors since it's one of the most requested features

NEW FEATURES:

SELECTABLE COLOR PALETTE:
- Color palette now stays the same through out the run, but you can select which one you want to use in the new start menu section. Added some new color palettes too bringing the total to 16.
- Not all color palettes are unlocked from the start. Most of them must be found in the dungeon.

BALANCE CHANGES:

GENERAL:
- Temple shrines grant 35→30 gold
- Temple shrines grant 5→3 keys
- Temple shrines grant random relic instead of guaranteed rare
- Challenge shrine grants slightly worse loot

BUGS:
- Blood baron: health 70→80
- Chief: health 120→160, shield 50→75

SPELLBOOKS:
- Nature tome: changed mana trigger to “50% chance on any debuff apply”, mana needed 12→10
- Cookbook: changed mana trigger to “on heal”, mana needed 12→14