Small update to Melting Pot to match the changes made to dwarven, goblin and half-orcish pops.

Made some small changes to professionalism. The scaling bonus to drill decay has increased to a maximum of -60%(from 50%), and the 60% and 80% thresholds each grant an additional +20% drill gain. The purpose behind these changes is to account for army drill decaying faster now that its defense modifiers have been reduced. Ideally, I would change the base amount of drill lost from reinforcing, but there's no define for that.

Furthermore, I've fixed some loc errors I came across.

Fixed an issue with wargoals not being updated properly, and made it so Assimilation Ideas increases the mtth for diggy's racial tension events.

Fixed a small issue with an event not having a proper trigger condition.

Made it so the damestear price drop event is tied to a country trading in damestear instead of being the lead producer.

Fixed some loc errors related to Strategic Ideas.

Added Castonath provinces to the list of exceptions for fort building, and fixed an error with the pop menu.

Fixed an issue where everyone was receiving the effects of Religious Wars for free.

Fixed a localisation error.

Fixes an error in the pop event menu.