Fixes z3ntu#21

Also add a kind-of working meson target that can be invoked with 'ninja src/libopenrazer/docs/html'

bool Device::setScrollBreathDual(QColor color, QColor color2) was creating a QBusMessage with:

QDBusMessage m = prepareDeviceQDBusMessage("razer.device.lighting.scroll", "setScrollBreathSingle");

Changed it to:

QDBusMessage m = prepareDeviceQDBusMessage("razer.device.lighting.scroll", "setScrollBreathDual");

Previously, all devices supported setting any value as DPI you wanted,
but the DeathAdder 3.5G only has 4 values available so add support for
that.

The 'configure' icon is not a standard icon theme icon and probably only
available in the Breeze theme, so the preferences button was basically
invisible for many users.

Fix this by using the 'preferences-system' icon; and also increase the
size of the icon from 16x16 to 20x20 to make it more visible.

Fixes z3ntu#50

- 'space bar' matrix assigned to [5, 7] to support BlackWidow Chroma v2 RGB
- still no 'razer logo' support for BlackWidow Chroma V2

	  Matrix Discovery
	modified :         src/CMakeLists.txt
	modified :         src/customeditor/customeditor.cpp
	modified :         src/customeditor/customeditor.h
	new file :         src/customeditor/kbdlayout.cpp
	new file :         src/customeditor/kbdlayout.h
	modified :         src/customeditor/matrixpushbutton.cpp
	modified :         src/customeditor/matrixpushbutton.h

	modified :         src/customeditor/customeditor.cpp
	modified :         src/customeditor/matrixpushbutton.cpp
	modified :         src/customeditor/matrixpushbutton.h

… correctly from the standart custom editor, for some reason it looks to be a shift somewhere

…layout values.. this wasted my time btw.

…r others keyboards ?

Fixes z3ntu#21

Also add a kind-of working meson target that can be invoked with 'ninja src/libopenrazer/docs/html'

Previously, all devices supported setting any value as DPI you wanted,
but the DeathAdder 3.5G only has 4 values available so add support for
that.

- 'space bar' matrix assigned to [5, 7] to support BlackWidow Chroma v2 RGB
- still no 'razer logo' support for BlackWidow Chroma V2

	  Matrix Discovery
	modified :         src/CMakeLists.txt
	modified :         src/customeditor/customeditor.cpp
	modified :         src/customeditor/customeditor.h
	new file :         src/customeditor/kbdlayout.cpp
	new file :         src/customeditor/kbdlayout.h
	modified :         src/customeditor/matrixpushbutton.cpp
	modified :         src/customeditor/matrixpushbutton.h

	modified :         src/customeditor/customeditor.cpp
	modified :         src/customeditor/matrixpushbutton.cpp
	modified :         src/customeditor/matrixpushbutton.h

… correctly from the standart custom editor, for some reason it looks to be a shift somewhere

…layout values.. this wasted my time btw.

…r others keyboards ?

Fixed double declaration in customeditor.h
Fixed meson.build to include new kbdlayout.{h,cpp} files like it was done in CMakeLists.txt before
Fixed meson.build in data/ to include the saved layout example file

Fixed some dialog boxes strings to be compatible for translations
Added and updated fr.ts translation file that was there before...
Updated de.fr translation

Fixed a typo in fr.ts

…ith double