Update 0.15.4

Content

• Added functionality to add abilities and converted the shop items Interrupt and all Cultist specific shop items into abilities.

Changes

• Shop item icons will now be colored gray instead of red when they can't be bought to avoid black icons when the base icon has no red colors in it.
• Internally replaced enum based ShopItems with string IDs to increase modularity.

Fixes

• Fixed sometimes not being able to select Video settings in-game because the dice roll UI was blocking raycasts.