Trek

# Vanilla structures update. Part 3: Monster rooms
## New content
- Huge overhaul of monster rooms. Added variations of monster rooms, depending on biome they spawn in and spawn height. They have simular spawn chances to vanilla monster rooms, but being different, they can not be located using chunkbase.
## Technical part
- Added compatibility with Minecraft version 26.2;
- Fixed crash on 1.19;
- `tower_island` renamed to `cottage_island`;
- `island_village_1` renamed to `tower_island`;
- Added bottom part to `tower_island`(new), added processor;
- Fixed terrain adaptation for `abandoned_castle_pillager` (other rare structures are planned next updates);
- Partially rebuilt/fixed `castle` (more fixing planned in future);
- Fixed flowing water in `farm_island` now it flows down from island upon generating;
- Added underwater columns to `offshore_pillager_platform`;
- Added tunnel leading to mining site under `claw_pillager`;
- Removed infested stone bricks, added processor in `graveyard`;
- Removed buttons from `stelzen`;
- Added air to `camp_1` and `camp_3`;
- `strange_house` divided into 2 parts, added terrain adaptation, removed excess spawners, added processor;
- Replaced campfires, added processor in `fort`;
- Changed `salt`.