Revert "Revert PartyNames-changes on develop-branch."

This reverts commit 43545ac47f.

Conflicts:
	VocaluxeLib/Menu/CNameSelection.cs

VocaluxeLib/PartyModes/IPartyMode.cs

@@ -101,6 +101,8 @@ namespace VocaluxeLib.PartyModes
         int GetMinPlayer();
         int GetMaxTeams();
         int GetMinTeams();
+        int GetMinPlayerPerTeam();
+        int GetMaxPlayerPerTeam();
         int GetMaxNumRounds();
         string GetFolder();
         void SetFolder(string folder);