Draggable Items Improvements

This release merges in changes from @mooped and @algnc to improve items and their draggability, as well as how they appear in the Equipment tab of the character sheet.

• Work around Foundry creating items with null icons and actors/items
• User Guide: Add apply damage/healing, fix table of contents, remove links to paid core book
• Set correct image for items on parsed PCs and NPCs.
• Add draggable item markup to zero and NPC sheets.
• Package dragged weapons and spells as Foundry Items with some extra DCC data embedded
• Handle negative speed (for armor penalty)
• Format in feet on the armor sheet.
• (Dev only) add styleint for CSS listing