AI naval build fix

1.12.x compatible

Fixed the AI so that it will build a more balanced navy including heavies.

Since Man the Guns the AI will primarily build screens. Meaning it will build light cruisers, destroyers, and Subs.

The Devs adjusted the AI to almost never build heavies to deal with player meta strategies.

Right now the AI will cancel any heavy under 25% completed (this is hard coded) and almost never builds a heavy or a battleship.

I adjusted the AI preferences so that they will go back to choosing a balanced navy with Battleships, it will still cancel ships but some heavies can be built.

The majors still have individual focuses such as Germany will still focus on submarines. Britain and US will focus more on destroyers.

I also added the ability for the AI to build Super Heavies, battle-cruisers, and carriers if they have researched them.

Known issues: Soviet AI will mainly build screens ---I think this is an issue with the amount of dockyards the AI has. Giving them more docks they built a balanced navy.

AI will still cancel most starting heavies ---This is a hard-coded intentional decision by the devs to allow the AI to be more flexible. But editing role_ratios I can encourage it to build new heavies once the screen of 4 to 1 ratio is achieved. ---The mod "Naval AI Production" will add in the original starting capitols that the AI cancels at 25% via a AI only decision as well as adds AI boosters to make naval combat more enjoyable.
https://steamcommunity.com/sharedfiles/filedetails/?id=2506845603

Not compatible with any mod which alters the following in AI_strategy: defaut.txt, GER.txt, ENG.txt, ITA.txt, SOV.txt, FRA.txt USA.txt, or the Japan text.

Version History v0.1 Base mod v0.2 Updated for 1.21.x