Changelog:
- Port GUI and underlying lib's (gxw/gxwmm) to GTK3 (gtkmm3).
- Port LV2 plugin GUI's to X11/cairo.
- Add Midi feedback support.
- Add new PowerAmp module.
- Add Slovak translation by Jozef Riha.
- Fix lv2 plugins containing executable stack.
- Add NSM support.
- Add midi out for tuner.
- Add low/high cut filter before tuner.
- GxTuner set to use same precision then the tuner in guitarix.
- Use tab-box for LV2 plugs with to much controls.
- Disable GxVibe, because it is broken.
- Fix several Bug's and hopefully don't introduce to much new ones...