Add conditions for skills and other things

[VariantKanno]

Preparation

• No one has asked for this feature before in other issues (even the closed ones)

Describe the feature

By conditions I mean something like
If servant X NP charge is less than 50%, then servant Y will use their skill on servant X
If servant X NP charge is 100% or more, then servant Y will use that skill on themself
If servant Z HP is less than 30%, use Command spell to restore their HP
and other things like that