* Refactored RGBController_GigabyteRGBFusion2USBBoards &
RGBController_GigabyteRGBFusion2USBLayouts into single
GigabyteFusion2USB_Devices to align with structure of
RazerDevices and CorsairV2Devices.
* Replaced definition for `gb_fusion2_layout`
* Adjusted code paths to suit new variable structures
* Removed redundant files
