JSON for several Spell costs needs overhaul

[Bernhard Jung]

Commit 647ce02 made improvements to how casting cost of a spell/chant is stored in JSON and in memory. It should now be possible in most cases to set the cost as a number. See the comment in the commit for details.

Now someone needs to go over the JSON files for spells and update the JSON

[Nando Neck]

Same should be done for Chants, and also Enchantments

[Bernhard Jung]

Searching in the source code for ‘“castingcost”: {’ should bring up all the places where this needs to be applied.