Changed how BTD6 API mods are handled
There are 2 kinds of btd6 mods. MelonLoader mods and BTD6 API mods. The difference is how you create them and how you load them in the game. BTD6 API mods require an injector to work, which use to be included in the mod manager. It caused a lot of confusion for people so it was removed. This version builds on that by offering support to players using BTD6 API mods. It now suggests they download the BTD6 API injector on Nexus.