Refactored Gigabyte Fusion2USB controller

* 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
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