Disable turning with joystick while paused or menu open

Also fixes mouse movements accumulating while paused.

- If you're playing with a controller, you can still turn the player
  while the game is paused or a menu is open. It's pretty jank as you
  may be controlling the faded scene in the background behind a menu,
  and it might make someone think their inputs aren't being read by the
  menu or that the game isn't truly paused.
- If the game is paused (with the pause key specifically, so that the
  mouse is still captured), then mouse movements continue to accumulate
  while you're paused, potentially causing a very sudden disorienting
  jump when the game is eventually unpaused.
- If you're chatting, then you can still look around (with the mouse or
  controller), though you can't move or shoot. This can be confusing if
  you don't realize you're locked in a menu (as every other case you're
  locked in a menu stops you from looking around with the mouse).

Quake/in_sdl.c

@@ -666,6 +666,9 @@ void IN_JoyMove (usercmd_t *cmd)
 	
 	if (!joy_active_controller)
 		return;
+
+	if (cl.paused || key_dest != key_game)
+		return;
 	
 	moveRaw.x = joy_axisstate.axisvalue[SDL_CONTROLLER_AXIS_LEFTX];
 	moveRaw.y = joy_axisstate.axisvalue[SDL_CONTROLLER_AXIS_LEFTY];
@@ -717,6 +720,10 @@ void IN_MouseMove(usercmd_t *cmd)
 	total_dx = 0;
 	total_dy = 0;
 
+	// do pause check after resetting total_d* so mouse movements during pause don't accumulate
+	if (cl.paused || key_dest != key_game)
+		return;
+
 	if ( (in_strafe.state & 1) || (lookstrafe.value && (in_mlook.state & 1) ))
 		cmd->sidemove += m_side.value * dmx;
 	else