Achaz: Enchantment volume calculation

[Nando Neck]

The volume calculation for “Schutz des Beutels“ needs to be like AP calculation.

1. level needs 3 volume
2. level needs additional 6 volume

The volume calculation for “Zauberspeicher-Kristallkugel“ needs to be like AP calculation.

1. level needs 5 volume
2. level needs additional 7 volume

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[Xaver Stiensmeier]

Not quite sure what’s requested by this issue.

[Nando Neck]

currently all enchantments have some volume parameters set, how much volume each enchantment uses or gives. and for these 2 enchantments there is some more complex volume-level calculation necessary, like it is, for the ap calculation, see https://bitbucket.org/Nargaff/the-dark-aid/src/85b07f6bd6b4226bcb6a85715016ca1a42097d94/src/rulesystems/dsa5aventurien/spab-combat.json#lines-43 for example, to calculate this value correct.