Merge pull request #379 from kripton/german

Translate new strings to german
Documentation: added VC Matrix documentation
Updated Dutch translation
Merge pull request #381 from joepadmiraal/Dutch_translation

Updated Dutch translation
RGBScripts no longer all reevaluated when switching script selection
Webaccess: fixed crash occurring on nested multipage/non-multipage frames
UI: Restored first tab selection in InputOutputPatchEditor
Webaccess: restored network configuration page after extenal CSS/JS change
Plugins/ArtNet: fixed QLC+ to QLC+ Artnet communication

After 377bfb55862c11a24206257cf35ecd8a6f9d4014 QLC+ ArtNet universes start from 0
VCMatrix: it is now possible to select custom properties for a RGB Script
do not reread the script directories every time we change a script
Merge pull request #382 from plugz/fix-rgbscriptloading

RGBScripts no longer all reevaluated when switching script selection
Show Manager: fixed a 'divide by 0' crash when a matrix is no longer available

(thus the retrieved duration is 0)
Merge branch 'master' of github.com:mcallegari/qlcplus
Virtual Console: improved Speed Dial layout and allow to set the visibility of each element of the widget
Virtual Console: added VCMatrix default size to global VC properties
Fixed test units with the latest RGB Matrix changes
UI: Matrix widget renamed to Animation widget (UI only)
Updated translations (UI)
Added audio triggers to vcwidget helper functions