beta v0.6 the item update

Changelog:

• Item store implemented
• New DoL upgrades involving the item store
• Tooltip with trait descriptions appears when hovering over unit/item info in town
• Unlocked tier 5-7 units become slightly more common in the shop at earlier rounds
• New traits: Brave, Drunken, Gilded, Loyal, Reaping, Rousing, Stealthy
• Units now fire different projectiles depending on faction
• New achievements, bringing the total to 43
• Probably other stuff I forgot I put in, idk