Add the ability to restrict how many of a glyph may be added to a spell, both in absolute terms and in conjunction with specific forms or effects.

I'm taking this one on myself.
To accomplish this I'm building a spell validation framework that will enforce any restrictions on what spells may be created.

It must:

• Stop the player from casting spells that violate the given limits.
  • Provide feedback when they attempt to do so.
• Stop the player from crafting spells that violate the given limits.
  • Provide feedback when they attempt add a glyph when it would make the spell invalid.
  • Provide feedback when they attempt to save the spell when it's invalid.

It should:

• Handle the existing restrictions such as no empty spell, only one form per spell, etc.