feat: Visualize Resource Consumption from Another Item, Ammo Switcher Style

[kgar]

https://discord.com/channels/1167985253072257115/1170004050578767973/1230994094965129247

From member of the Tidy community:

Had a player request an idea last night that would be pretty slick. Now that Resources are going away and we're having to rely on Item Charges as a replacement, there's not a great way to see that behavior in the character sheets. Especially when you have items that use charges from another item.

Items using ammunition do this already, and items that have Limited Uses show up. It would be great to fall back if one/either of those are not set to fill that slot with Resource Consumption settings instead. Monks would be the main base class that would benefit from this, but plenty of other classes do similar setups (e.g. I have one player playing KibblesTasty's Psion and another playing a Heavyarms Gunslinger).

The key would be making it work for Spells as well. In terms of general utility it's also the only Core Foundry method to set up Spell Points right now.