The Cleansing of the Crystal Sea

22 May 2020:  AI bugfixes, difficulty selection, and minor balance changes

- Hopefully fixed broken naval attack triggers

- Fixed bug that allowed massive endgame naval landings

- Slightly moved buildings to prevent attack waves from getting stuck

- Added a basic difficulty selection that modifies enemy damage dealt/taken

- Reduced Lancer damage by 17% and changed their cost from 30/15 to 25/20

- Increased Squall anti-air damage by 13%

- Reduced Nuke cooldown and cast time by 1s

- Fixed Cerberus mines and increased their duration by 30s

- Added cerberus mines around enemy bases

- Improved Wharf repair rate by 100%

- Allowed Carriers to repair air units

- Increased Viking fuel capacity by 10% and vision by 10%