Gearbox: tap/hold usage of inventory items

[mmaulwurff]

Submitted by ShockwaveS08 on ZDF:

1. Quick-tap of inventory wheel button: use currently-selected item
2. If held for longer than a specified (configurable) duration, bring up the wheel without using an item

This sort of thing would greatly benefit not just gamepad users on desktops, but also gamepad users on Delta Touch.