Forge&MCP update + many fixes
Created by: Koward
The code compiles with the most recent Forge version (2154). The game runs (there are bugs, but it runs).
I see some blocks/items/entities just disappeared. For a couple of them it's expected : the registry name had to be changed because it was camelCase and Forge now enforces snake_case, but most of blocks/items/entities were already good so they should stay in the world.