Added tier 2 for toxic baths.

Setted Imperial Capitals as high possible capital.
Imperial Capitals can be upgraded from capitals tier 6 (last).
Imperial Capitals have better stats than in vanilla.

Changed Oribital Buildings - list below

orbital psi corps:
changed needed technology
stability 5 -> 20
telepath 2 -> 8

orbital shield generator:
changed needed technology
hardening shield for planetary defense station and starbase 25% -> 50%
shield points for planetary defense station and starbase 25% ->
cost dark matter 0 -> 100
upkeep dark matter 0 -> 4
upkeep energy 5 -> 26

orbital galactic stock exchange:
changed needed technology
trade mlut 20% -> 40%
merchant 2 -> 4

noble estates:
changed needed technology
noble 2 -> 3
housing 2 -> 3

slave processing facility:
changed needed technology
slave prod. mult 5% -> 10%
slave political power -25% -> -50%