Towers Of The Wild

- Added a jungle tower variation, with vines, that only spawns in the jungle;

- Added an icy tower variation, with a big block of ice at the bottom of the tower, that only spawns in icy biomes;

- Added the derelict tower, a ruined version of the tower that has 15% chance to replace a regular tower by default; 

- Added a cross-compat feature with the Waystones Mod. If installed, a waystone will now appear by default at the top of the tower, but this can be changed in the config file;

- Added a config option to disable tower spawning for all biomes of a specific mod;

- Added a config option to set the proportion of derelict towers among all towers;

- Improved a bit the integration of the structures in the landscape;

- Towers will no longer be floating over water, a grass platform will now appear beneath if they appear to have spawn over water.