added elexol modules
Merge branch 'master' of https://github.com/sall/vixen

Conflicts:
	Vixen.sln
solution file with elexol controllers
VIX-315 Effect info hover bug.Fix bug and enhance performance.
Clean up draw element selection.
Remove broken and unneeded VisibleRows setter.
Effects cannot be added to a playing or paused sequence, so do not give the illusion they can.
Fix a bug where if the playback start/end marker was reset to the start/end, it would revert to the previous mark after playing.
New output plugin for the Elexol Ethernet controller
Merge remote-tracking branch 'remotes/eberletj/master'. Manually fixed up the Vixen.sln conflict.
Fix up a few config and project issues with the ElexolEtherIO project.
Remove the ElexolUSBIO module in the solution for the time being (since there's no code committed for it).