Post-jam update for Kingdom Gate TD

New post-jam update!

Still might need some polish and extensive testing, as it's a relatively big one.

• Added multi-select. If you select at least one tower, all towers will be affected when changing/upgrading/selling. When building a new tower, it will build on all selected tiles. Prices reflect the cost of all actions combined.
• Added hotkeys. When building towers, press 1-9 to build the corresponding tower/farm/wall based on the order in the list on the right. When selecting existing towers, will change its strategy.
• Press E to buy the current effect on selected towers
• Press X to sell selected towers
• Added Fast-Forward checkbox! Will run as fast as your rig can handle while still trying to achieve smooth FPS. If the game is already struggling without this active, it obviously won't do anything. The desktop version is massively faster than the webGL version so feel free to try that if you want speedy mobs!
• Reworked some code to improve performance. Introduced new code to reduce performance.
• Element changes: Effects can now be applied to targets that resist that element. The damage being halved was punishment enough.
• Balance changes: Walls and some towers have more HP. mobs are also a bit more tanky overall, except for the bosses which have been nerfed a little.
• Balance changes: Reduced AoE power of AoE mobs. It still hurts, but a bit less and they won't steamroll as much as before.
• Balance changes: Reworked some towers. Mortar now has a longer range than sniper. Arrow tower has higher DPS making it stay relevant. Pricing had a minor rework. Close range towers are more effective to offset the risk. Snipers aren't king anymore, they're still good but not as good as before.
• Fixed some small UI issues
• Fixed some bugs