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.
Confusing comment, "Takes a (NULL) cWorld pointer".
Use instead: "Sets a_World to the world where the player will spawn, based on the stored world name or the default world".