Preview of mercurial roller, settings tweaks, and action die fixes

• Mercurial effects are rollable from the spell sheet (filling in value, or summary and description if a table is configured)
• Settings have been reworked to fix some issues (Disapproval compendium now applies without a page reload)
• Spells inherit action dice by default and respond to the Action Dice dropdown, or can be configured to use a fixed die (for special cases, mercurial effects, etc)
• Module integration hooks