Initial work on the isoworldremote plugin, which sends sections of the map to isoworld.

Signed-off-by: Japa <japa.mala.illo@gmail.com>
Merge branch 'IsoRemote' of github.com:JapaMala/dfhack into IsoRemote

Conflicts:
	plugins/CMakeLists.txt
	plugins/isoworldremote.cpp