Drag & Drop Traders & Services

* Added support for Drag & Drop traders.
* Added money to Drag & Drop attributes.
* Added --restock command to support trader inventory restocking.
* Fixed issues with 'items:' equipment tag in class/race definitions.
* Added RemoveBlankLines() to tidy tables on creation or overwriting a new NPC.
* Added weapon proficiency slot management, and proficiency training sequence support.
* Extended item conversion system to convert legacy Items table to multi-table approach and make better use of character sheet, and allow money management.
* Extended Drag & Drop "random" item to add item class specification as in "random(item-class):qty".
* Fixed evalAttr issue with unbracketed calculations.

Author: DameryDad