Portals and others

+ End and nether portals with configurability
+ Bed homes
+ Cauldrons fill
+ Added time and weather saving
* ~~Fixes #1066~~
* Fixes #1012, fixes #1194

Portals don't construct/search for a destination portal yet.
The usual approach to this is to make both functions non-virtual, and each of them calls a virtual protected function that has the common code and can be overridden.