[repos] lgprotocol: import shared protocol definitions

Add LGProtocol as a pinned submodule and consume its KVMFR protocol
definitions throughout the client, host, IDD, OBS, and profiler.

Keep Looking Glass framebuffer helpers local while removing duplicated
protocol headers and migrating users to KVMFR-scoped types.

idd/LGIdd/postprocess/D12FrameFormat.cpp

@@ -87,12 +87,12 @@ DXGI_FORMAT D12::Dxgi(FramePixel pixel)
   return DXGI_FORMAT_UNKNOWN;
 }
 
-FrameType D12::Type(FramePixel pixel)
+KVMFRFrameType D12::Type(FramePixel pixel)
 {
   return Type(Dxgi(pixel));
 }
 
-FrameType D12::Type(DXGI_FORMAT format)
+KVMFRFrameType D12::Type(DXGI_FORMAT format)
 {
   switch (format)
   {