Remove feauture that It is necessary to have vassalage to declare a war of vassalage because create bug.
Next week fix.

Now you must first request vassalage in order to have the casus belli for vassalage.
To request vassalage, you must have a fleet at least superior.
Now you cannot make a secret agreement to become a vassal of another if the other does not have domination.
Now it indicates in the domination tradition that if you adopt it, you can vassalize other empires.

Fix bonus skill at excavation.
Cambiato empire size a 100 ma facendo rimanere i pesi proporzionati.
Fix nuke planet start

Fix naval capacity limit battleship and carrier.
When integrate vassal now not lose all system of vassals.

Rebalance offspring.
Add offspring Carrier.
Fix little problem with origin galactic doorstep.

Fix weapons

Removed planet_jobs_engineering_research_produces_mult from latent_psionic trait because there is no bonus on psionic for planet_jobs_engineering_research_produces_mult.
Decreased trait_robot_propaganda_machines from 0.1 to 0.4 due to the addition of planet_jobs_unity_upkeep_mult = -0.1.
Fixed bug in paradox's species_trait on slave_cost repeated.
Force ideology now forces ideology on vassals as well, as in 3.7.4.
Added first_contact_dlc_effects.txt: added phi research lab.
Added overlord_initializers.txt: added phi research lab.
Changed peaceful ethic's country_admin_cap_mult to empire_size_mult x*-1.
Replaced phi archaeologists with archeoengineers.
Changed diplostance to phi's in overlord_initializer.
Moved all empire limits for ships to ownership_limits.
Removed subjects folder as it is now managed differently.
Changed Subjectype condition to any_agreement = { agreement_preset = preset_thrall }.
Converted all pop_factions_influence_produces_add = x to pop_factions_unity_produces_mult = x/10.
Changed pop_factions_unity_produces_add x to pop_factions_unity_produces_add x/20.
Removed "buildings_no_exotic_gases = yes" because it was removed in 3.7.4.
Removed ownership_limits = default from federation as it was removed in 3.7.4.
Removed show_agreement_terms = no from wargoal, unsure if intentional but not used anymore by nesusna in 3.7.4 in 00_war_goals.txt.