- Add unset command for cvars created by the user

- Fix crash bug when maximum number of cvars has been reached
- Fix cvar_restart
- Add possibility to cleanly switch mods ingame (#2819)

code/null/null_client.c

@@ -85,6 +85,10 @@ void CL_FlushMemory( void ) {
 void CL_StartHunkUsers( qboolean rendererOnly ) {
 }
 
+void CL_Snd_Restart(void)
+{
+}
+
 void CL_ShutdownAll(void) {}
 
 qboolean CL_CDKeyValidate( const char *key, const char *checksum ) { return qtrue; }