Pet-Editor/Companion: Allow adding other "heroes" as companion

[Neintonine]

Is your feature request related to a problem?

Currently you only can add pets as companions. There is possiblity that you have humanoid character as companion.

Describe the solution you'd like

Idea is, that you create the humanoid character as a normal "hero" and specify everything. Afterward you go back and specify him as companion in your character. In the character sheet is only display such basic information like name or attributes and the rest is on the character sheet of the character.