variantlist for chant blessings

[Nando Neck]

for the spab karma: “Hauptsegnung“ a blessing needs to be selected, so a variant list, to limit the list to chants for the group “segnungen“

[Nando Neck]

Issue #105 was marked as a duplicate of this issue.

[Bernhard Jung]

Fixed in commit d35ba0a

The definition of the variants now allows to set a list of changroups similar to the skillgroups and spellgroups attributes that could already be set.

I corrected this for the special ability Hauptsegnung.