[common] lgmp: separate transport configuration

Move LGMP queue tunables into LGMPConfig.h and keep compatibility
aliases in KVMFR.h. Promote color-transform, SDR white-level, and
damage-limit definitions to transport-neutral common types so non-LGMP
transports do not depend on the KVMFR wire format.

host/platform/Windows/capture/DXGI/src/dxgi.c

@@ -30,6 +30,7 @@
 #include "common/rects.h"
 #include "common/runningavg.h"
 #include "common/KVMFR.h"
+#include "common/LGMPConfig.h"
 #include "common/vector.h"
 
 #include <math.h>

host/platform/Windows/capture/NVFBC/src/nvfbc.c

@@ -31,6 +31,7 @@
 #include "common/rects.h"
 #include "common/thread.h"
 #include "common/KVMFR.h"
+#include "common/LGMPConfig.h"
 #include "common/vector.h"
 #include <stdlib.h>
 #include <stdatomic.h>

host/src/app.c

@@ -26,6 +26,7 @@
 #include "common/option.h"
 #include "common/locking.h"
 #include "common/KVMFR.h"
+#include "common/LGMPConfig.h"
 #include "common/crash.h"
 #include "common/thread.h"
 #include "common/ivshmem.h"