Workaround race conition in uDMX driver

Avoid deadlock if device is closed before thread has started

Signed-off-by: Paul Brook <paul@nowt.org>
Spanish Translation (monitor)
Function Manager: fixed nested folders failure
Merge branch 'master' of github.com:mcallegari/qlcplus
Fixture Group Editor: improved the layout and added a tooltip to the cells
Monitor: enable universe monitoring also for the 2D view
RGB Matrix Editor: show only the proper controls of each algorithm
Plugins: added reference count to plugins with "infinite" capabilities

ArtNet: do not send a PollReply when receiving a PollReply !
InputOutputMap: the same plugin mapping is now allowed on more than a universe
Plugins: universe number is now emitted in case the same line is connected to several universes

SPI: first implementation of multi-universe channels autodetection without fixtures in a project
Plugins: DMX USB always transmits a whole universe (512 bytes)

Updated changelog
InputOutputManager: improved universe add event
Added fixture: Pro-Lights ARCLED7314HD (thanks to Tolmino)
Plugins: SPI use correct sysroot to cross-compile
Merge branch 'master' of git://github.com/mcallegari/qlcplus into translation
Merge pull request #281 from tornel/translation

Spanish Translation (monitor)
Merge pull request #279 from pbrook/master

Workaround race conition in uDMX driver
WebAccess: added slider's event to be used on a touchscreen
Monitor: show channel's icon in DMX view mode
Fix angles for American DJ Sweeper Beam Quad LED