Hexworld 0.5.10

Unexpected Monday patch due to some severe exploit found. 👀 Fixes and Improvements: - Fix for exploit allowing free structure upgrades (thanks Mefistofel) - Floating hexagons now should fly around obstacles on a level - Floating hexagons can not be sacrificed, sold or swapped anymore - [Abilities] Fireball Strike L3 now shoots 6 projectiles per tile instead of 4 (thanks Rose) - [Abilities] Fortify Structure and Disable Structure should not use mana when cast on empty tiles - [Abilities] Purify Tile can be applied on tiles with structures now