BRAKING CHANGE: Made limits work per world or per multiple worlds
While this change could have been done without braking existing setups,
I think it is the perfect point to fix some ugly stuff:
configured-limits now have their own configuration-section, permissions
are in line with the timer's 'disobey' syntax.

The new concept should still be easy to use for global setups, but also
covers more complex approaches. The default-limit is forced to be
global, other limits can be configured to match only warps on certain
worlds. Players can disobey limits per type and world, per world only,
per type only, and completely. All permissions use internal parent/child
structure so there is no overhead when checking on creation.
Merge branch 'master' into per-world-limits
Made /warp assets display the warps per limit
Removed debug output
Added missing java docs
Refactored warp-limits to be more understandable.
Fixed /warp assets for overlapping limits
While I do not see why anybody would want to have two limits overlapping
each other it is possible (which means also accidentally possible) and
therefore /warp assets should show the situation as it is configured.
Removed some lines that were already commented out
Merge branch 'per-world-limits'