Remove RAM stored mesh data

Remove RAM stored vertices and indices data. It is now stored only in
GPU memory.

graphics/src/vulkan_commons.c

@@ -20,7 +20,7 @@ void rse_update_time()
     g_float_delta_time = (float)difftime(g_this_frame_time, g_last_frame_time);
 }
 
-float inline rse_get_time_diff()
+float rse_get_time_diff()
 {
     return g_float_delta_time;
 }