Rogue table & Mods for Thac0, Dmg & HP

* Expanded scanForArmour() to also scan for Thac0 and HP mods, and changed its name to scanForModifiers().
* Added tokenID to Mods table - if blank apply mod to character, else only apply mod to token.
* Added updateHitDmgBonus() to convert character sheets to use new mods table as and when GM desires.
* Code tidying and some utility functions moved to library.
* Improved error handling and type conversion.
* Made scanForModifiers() asynchronous.
* New dialog for displaying what effects and mods impact thac0, dmg, ac & hp.
* Added functions to auto-populate, display, and explain current rogue skill values.
* Correct item speed assessment to use inheritance via resolveData().
* Added doSetMod() function and commands to support new extended modifiers functionality.

Author: DameryDad