Add XML Schema for fixture definitions

The point is to help with checking fixture files
Automatic changes to fixture files:

- added namespace
- fixed some author names
- removed ,,, from author names
- changed decimal , to decimal . in weights
Make Lens degrees type qreal - Robe Robin 600E Beam has max degree 6.5
Add XML namespace when saving files
Update script to use schemas
Fix Martin Roboscan - remove duplicate tag
Improved script - added channels/heads
Fix fine channels in fixture definitions
Normalize Pan/Tilt channel names
Merge branch 'master' of git://github.com/mcallegari/qlcplus into translation
Spanish translation 4.7.0
Plugins: added configuration panel to SPI plugin

RGB Scripts: added "vertical fall" preset
Merge branch 'master' of github.com:mcallegari/qlcplus
Merge pull request #235 from basileus/master

Added fixtures: DTS Max FAR, DTS Nick NRG1201
Merge pull request #239 from janosvitok/xml-schema-fixtures

XML schema for fixtures & some fixture fixes
Fixtures: actually added 2 new fixtures
Add namespace, update FixtureMap
SimpleDesk: fixed another crash introduced with Universe used channels

SimpleDesk: Optimized show event
Plugins: fixed SPI plugin build on Qt5
Plugins: improved ArtNet network mapping, improved SPI line close