Setup expansion planner to factor in past retreats.

[EricJFisher]

When expanding the order of operations is:

• System you've never been retreated from where less than 7 factions are present
  If none:
• System you have been retreated from where less than 7 factions are present
  If none:
• System with the lowest influence on a "non-native" faction (faction whom that system is not their home system)

Currently the expansion report lumps the first two in the same bucket when they should be separated, at this time I don't have a clear way to resolve this since the APIs don't list "all factions ever present" or similar to check for retreats and pulling all past data to check for a faction having been present in the past is doable... but would come with a significant impact to performance and hit EliteBGS's API harder than I'd feel comfortable doing. (I don't want to negatively impact EliteBGS by being abusive in my api calls)