Defiance: The Exchange Client Hotfix #1

* Added a confirmation popup when posting or purchasing a listing on The Exchange.
* Fixed a bug that was causing a listing fee to not be charged if a player does not have enough scrip.
* Fixed a bug that could cause the count for Available Listings in the Exchange interface to show negative values.
* Fixed a major client crash when browsing the Exchange.
* Gamepad users can now hold down the (A)/Square button to more easily reach higher asking price values.

* Fixed a client crash that was being caused by the salvage matrix context menu in the inventory.