Implement [Faction:self] as a keyword to use the grid's faction

[OldManKatan]

A lot faction and reputation actions use the grid's own faction. A large number of components in a few mods could be reduced to a single, simple, and reusable triggergroup if you were able to create a "self" keyword that would use the FactionID of the grid's current faction.

Example use cases:

        [RivalAI Action]

        [ChangeAttackerReputation:true]
        [ChangeAttackerReputationFaction:self]
        [ChangeAttackerReputationAmount:-5]

        [RivalAI Target]

        [MatchNoneFilters:Faction]
        [Factions:self]

Ok, Target is admittedly not the most useful example, but the usage should be illustrative of intent.