Part of the work needed for #6727. Would appreciate a heads-up on if these changes are acceptable.

• Redid the icons on all of the cantrips to make each one stand out a bit more. (Including assigning icons to the activities)
• Most spells default activity names have been renamed from Use Save or Summon into Cast Spell in order to pretty them up a bit.
• Activities such as Chill Touch, Guidance, Ray of Frost, & Resistance now have applicable Active Effects.
• Reference enrichers were added for rules like &reference[brightlight] and &reference[stable].
• Added Description to Shillelagh's enchantment (basically just the spell's description slightly modified).
• Mage Hand now has a 2nd activity to "control" the mage hand, doesn't do anything other than a reminder that controlling it is an action.
• Minor Illusion has a Check activity that can be used to make an Investigation check against the caster's Spell Save DC.