Add keys for SDL 2.0.14's new gamepad buttons

This fixes the additional buttons triggering binds for ioq3 left
and right joystick direction keys.

code/client/keycodes.h

@@ -290,6 +290,13 @@ typedef enum {
 	K_PAD0_LEFTTRIGGER,
 	K_PAD0_RIGHTTRIGGER,
 
+	K_PAD0_MISC1,    /* Xbox Series X share button, PS5 microphone button, Nintendo Switch Pro capture button, Amazon Luna microphone button */
+	K_PAD0_PADDLE1,  /* Xbox Elite paddle P1 */
+	K_PAD0_PADDLE2,  /* Xbox Elite paddle P3 */
+	K_PAD0_PADDLE3,  /* Xbox Elite paddle P2 */
+	K_PAD0_PADDLE4,  /* Xbox Elite paddle P4 */
+	K_PAD0_TOUCHPAD, /* PS4/PS5 touchpad button */
+
 	// Pseudo-key that brings the console down
 	K_CONSOLE,