Add recentering

Signed-off-by: Slendi <slendi@socopon.com>

src/LunarWM.h

@@ -190,6 +190,10 @@ typedef struct LunarWM {
 		PFN_xrDestroyHandTrackerEXT DestroyHandTrackerEXT;
 		PFN_xrLocateHandJointsEXT LocateHandJointsEXT;
 
+		Quaternion recenter_rot;
+		Vector3 recenter_trans;
+		bool recenter_active;
+
 		bool session_running;
 	} xr;
 
@@ -201,8 +205,6 @@ typedef struct LunarWM {
 		Camera3D camera;
 		Shader linear_srgb;
 
-		Vector3 center;
-
 		Skybox skybox;
 	} renderer;