[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.

client/tests/clipboard_files_test.c

@@ -23,7 +23,7 @@
 #include "test.h"
 
 #include "common/debug.h"
-#include "common/KVMFRClipboard.h"
+#include <LGProtocol/KVMFRClipboard.h>
 
 #include <fcntl.h>
 #include <pthread.h>