Remove leadership aura feature

[Goosius1]

Description:

• The "leadership aura" feature is extra complexity without any added value
• There is already an implicit leadership aura at work during battles, i.e. when players with actual leadership qualities are doing their thing, so an explicit dynamic points change is unnecessary to get the required effect.
• By removing the feature, it also makes space for servers to enable much more usefully complex features such as the counterratack booster.
• I checked with the testers channel and confirmed that this feature is not generally considered useful, and is already turned off on multiple servers.

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New Nodes/Commands/ConfigOptions:

N/A

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Relevant Issue ticket:

N/A

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• I have tested this pull request for defects on a server.

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