Debug: enhanced rule debugging prefix.
RuleDSL: merge IfSpell into AddRuleFor and Configure.

This allows a centralized, better handling of provider spells.
Fixed the slash command to open configuration panels.
One can now pass a spell link to the slash command to configure it.
Use check buff with identifier instead of name even for single buffs.

Some classes have different buffs with different effects, depending on specialization, but the same name.