iMac Navi and Lexa additions

[Ausdauersportler]

• added Lexa spoofing in case the detected card has 0x67FF device-id (logic currently cannot tell difference between spoofed Lexa card and real Polaris card and therefore will not add spoofing in case we have found a Lexa card)
• added RX6600M logic, vBIOS for injection and settings to enable internal display
• added setting for RX5500XT to enable internal display (you can use either internal or external, but not both - still unresolved)
• added and_navi patching logic
• added graphics-override for NAVI23 (aka RX6600M) to GUI and added logic
• changed WhateverGreen Navi patch to reflect use of Monterey framebuffer even with patched Ventura and later (instead of patching backlight functions on Ventura+ framebuffer).
  Note: patching does not work automatically since the Ventura+ native framebuffer halts final installation stages before auto-patching takes over, currently no solution for this problem