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
Add InputExecutor to execute input each frame
BAAWrapper fix - also LFCR issue