Channel Modifiers: Logarithmic template renamed to Exponential
Channel Modifiers: added 6 new Exponential/Logarithmic templates (thanks to Luis García-Tornel)
Add XML schema for channel modifiers
Add new modifier template: 5% preheat
Sort channel modifier templates
HUGE: generic input relative mode implementation

HID plugin changes reverted. Relative settings moved in the Profile editor.
Relative values handling code has been moved into QLCInputSource class.
QLCInputSource class has been turned into a QObject/QThread subclass. Each input source
in relative mode starts up a thread to emit synthetic values.
VCWidget sends input values and 'feedbacks' to its input sources in relative mode
to keep in sync with the external controller and the UI status.
Reviewed a few includes all over QLC+.

Note: QLCInputSource must now be used as a pointer and not as a static class.

TODO: update profile editor documentation
VCSlider: level channels monitor is now an option in the configuration dialog (default = disabled)
Fixed Windows build
[WIP] Virtual Console Frames can now be enabled/disabled
VCSlider: attempt to fix wrong behaviour of DMX values monitoring