Fixed some relics giving museum workers the wrong modifier

**Archeology**
Museum Workers Have been renamed to Precursor Historians (Will use Museum Workers as name here)
Museums now provide only 1 Museum Worker jobs
Museum workers now only has additional bonuses from precursor relics
Museum workers no longer produces unity equal to the number of relics you have
The Museum building now produces unity equal to the number of relics you have
All Museum worker bonuses from relics reworked
Opener and Archeological Training combined and reduced
Added: Meticilous Excavation
Knowledge of a Legacy (Old: Fascination of Past) experience bonus reduced to 100 from 300

Fixed the other half of the mistake in plexian cloning vats

Fixed a mistake in the plexian cloning vats

Hopefully made the plexian clone vats work

Changed ruler leader class of the Tirian Holy Empire to commander

Updated the Archivist Enclave to include the option to hire an archivist leader (First introduced in "More Enclaves")
Also updated it to use the new coloring scheme for the event window (First introduced in "More Enclaves")

Added support for "Museum worker output for forgotten empires"

Changed on_survey to on_planet_survey