Added new explosive items and workbench

Added 10+ new item definitions (not all in working order yet)

Removed the "AddHPText" UI element.

Moved "/additem" to staff level 3.

Removed damage debug messages for staff level 3.

Ignored damage code for on-duty admins.

Fixed the position of the Mt. Chill Receiver item.

Added a workbench world feature for a future update to crafting.