v2 casting options field support

[augustjohnson]

casting options vary, and the following fields may be used to define higher levels.

1. Whether or not it requires concentration (example, TOH Less Fool, I) https://open5e.com/spells/less-fool-i
2. Effect Range/Magnitude https://open5e.com/spells/fusillade-of-ice - The range is still Self, but the effect magnitude will change.