Initial pathfinding API

Signed-off-by: fullwall <fullwall25@gmail.com>
Implemented a layered world generator

Signed-off-by: Irmo van den Berge <bergerkiller@gmail.com>
Merge pull request #488 from bergerkiller/master

Implemented a layered world generator
Added force parameter to getUpdateMessage for absolute/force updates
More info in the javadocs for DynamicMaterials
Added threadlocal random generator
Merge pull request #485 from fullwall/master

Implement basic pathfinding API
Deadlock safety
Added a check to make sure dynamic ranges are limited to 1 region away
Added multi-tasker for multithreaded task handling

Signed-off-by: Irmo van den Berge <bergerkiller@gmail.com>
Merge pull request #489 from bergerkiller/master

Added multitasker class to handle multithreaded processing of tasks
Thread annotations move
MultiTasker update to use enums and indicated that start/stop/finish are not thread safe
Made multitasker class more versatile, not restricting to runnables

Signed-off-by: Irmo van den Berge <bergerkiller@gmail.com>
Merge pull request #490 from bergerkiller/master

Made task handling part of the multitasker class itself
Retry file write when a ClosedByInterruptException is thrown
More protection for ClosedByInterruptException
more ClosedByInterruptException handling
Added delete method to SimpleRegionFile
Missing method