Version 1.3.0

CK3 1.13.1
Vic3 1.7.6
Imperator 2.0.4

Fix false positives
* ck3: soundeffect name matching is case insensitives
* vic3: straighten out localization for diplomatic actions
* vic3: fix localization for standard of living modifs
* fix scope types for several fields

Features
* ck3: Update to 1.13.1
* ck3: validate music player categories
* ck3: allow `switch` in script values
* ck3: accept ?= in switch blocks
* vic3: validate split culture and religions in create_pop
* vic3: handle building has_max_level modifiers
* validate music files