Randomize Basic Nemesis Cards in Expeditions

[elmodor]

Is your feature request related to a problem? Please describe.
For each battle, the basic nemesis card set to use should be randomized and displayed. For example when you fight a nemesis inside the "Before Fight" screen there should be an additional item "Basic Nemesis Card Set: Outcasts". This would tell the user to use all basic nemesis cards from the outcast set for this fight.

Describe the solution you'd like

• It could be implemented similar to the normal randomizer where you fight a single nemesis. There is a section "Nemesis Cards" displaying all nemesis cards to be used for this fight. This would allow to use basic nemesis cards from different sets but makes the setup quite more complex
• I would prefer that a single basic nemesis set is used for each fight. Int he community it seems to be recommended to not mix up basic nemesis cards from different set (keeping Outcasts basic nemesis cards separated from The New Age). If you organized your Aeons End content like this, it is easier to setup one single basic nemesis set from one wave directly.

Describe alternatives you've considered
See section above

Additional context
Notes from on3iro:

• The expedition seed needs to be taken into account
• The API of the custom expeditions needs to be extended
• Change the documentation accordingly