Multiple Action Dice + Bug Fixes

from @mooped:

• Bumped compatibleCoreVersion to 0.7.5 and upped the minimumCoreVersion to 0.6.6 as that's the other version I test before pull requests
• Separate die and modifier for the Cast Spell From Scroll thief skill
• Implement rollable treasure (when assigned to a sheet and the treasure item contains a die expression it can be rolled by any owner)
• Implement currency conversion (for owned treasure items marked asCoins)
• Use selected action die in the appropriate place (ie. not saves which always use a d20)
• Handle multiple action dice via the config window
• Sheet provides a dropdown to select a dice contained by the action dice expression
• Action dice field can be dragged to the hotbar to quickly select the current die size
• Optionally show maximum ability scores for tracking luck spend and spellburn
• Upper level parsing and improvements to zero level parsing (more sheet fields are filled in where previously they were added to notes only)
• Fix nasty race condition triggering an infinite loop of adding currency when combining asCoins items in some circumstances
• Allow removing the ability score label for spell checks for use with custom classes
• Speed is always shown in feet with an apostrophe, and the field uses a custom formatter that understands and validates this