Bug Fixes & Small Changes

While I work on the mazing gameplay I was made aware of a few bugs so I've decided to release a patch in the meantime.

Patch Notes:

• Fixed all Towers failing to level if a player sells a Tower in the same frame it received XP.
  
• Presents now drop beyond wave 50 in Endless Mode (for real this time).
  
• Capacitor Aura will no longer consider abilities that cost negative mana to cast.
  
• Max Player Limit in multiplayer increased to 6. With the recent performance improvements this should be manageable for a midrange gaming PC to handle.
  
• Endless Mode delay between waves no longer the same as normal mode. The delay between waves will now reduce to 0s by wave 100. Speed waves will reach a wave delay of 0 at wave 150.
  
• Optimized Snowman bone hierarchy to improve performance when many are built.
  
• Reality Shard mana cost can now be reduced by its Tower's mana cost reduction percentage.