Add control to change Weapon Lock setting

[SpaceManiac]

A common feature request is a button to control Weapon Lock. There are two possibilities:

1. Tap to toggle Weapon Lock state.
2. Press and hold to temporarily toggle Weapon Lock state until released. I think I like this one more - like a "pick up" button if you usually play with Weapon Lock on.

Additionally:

• The control should work on gamepads, likely the "X" button since "A" and "B" are fire and special.
• Ideally it should be a rebindable key as well.
  • Warning: the current profile layout is only set up for 2 sets of 6 keys; this 7th key will have to be stored in another location.
  • There should be two reasonable default binds.
• The control could be made available in the "Keypress" special trigger, to be an additional option for world builders.