[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/renderers/EGL/desktop_rects.h

@@ -26,8 +26,8 @@
 
 struct DamageRects
 {
-  int count;
-  FrameDamageRect rects[];
+  int                  count;
+  KVMFRFrameDamageRect rects[];
 };
 
 typedef struct EGL_DesktopRects EGL_DesktopRects;
@@ -40,14 +40,16 @@ void egl_desktopRectsMatrix(float matrix[6], int width, int height, float transl
 void egl_desktopToScreenMatrix(double matrix[6], int frameWidth, int frameHeight,
     double translateX, double translateY, double scaleX, double scaleY, LG_RendererRotate rotate,
     double windowWidth, double windowHeight);
-struct Rect egl_desktopToScreen(const double matrix[6], const struct FrameDamageRect * rect);
+struct Rect egl_desktopToScreen(const double matrix[6],
+    const struct KVMFRFrameDamageRect * rect);
 
 void egl_screenToDesktopMatrix(double matrix[6], int frameWidth, int frameHeight,
     double translateX, double translateY, double scaleX, double scaleY, LG_RendererRotate rotate,
     double windowWidth, double windowHeight);
-bool egl_screenToDesktop(struct FrameDamageRect * output, const double matrix[6],
+bool egl_screenToDesktop(struct KVMFRFrameDamageRect * output,
+    const double matrix[6],
     const struct Rect * rect, int width, int height);
 
 void egl_desktopRectsUpdate(EGL_DesktopRects * rects,
-    const FrameDamageRect * data, int count, int width, int height);
+    const KVMFRFrameDamageRect * data, int count, int width, int height);
 void egl_desktopRectsRender(EGL_DesktopRects * rects);