Bugfixes, performance improvements, quality of life and system changes

Changelog:

• Changed how mana reduction works
• Max mana reduction is now multiplicative instead of additive
• Combat caster does now decrease a fixed amount of mana instead of a percentage
• Reduced drafting wheel tool tip times
• Improved performance in the potion dealer encounter
• Fixed bug where drafting wheel was shown too early
• Fixed bug with potion dealer