Minor improvements and fixes
- Company Notepad, Alliance Description and Aircraft Nickname fields updated to UTF-8 format, allowing storage of various special characters. 🛫😎
- Made some re-structuring on how some game content / scripts are loaded, for better performance for the future.
- Compacted the side "filters" menu a bit in mobile, to make all content fit better to a small screen.
- Updated some backend libraries.
- Minor technical changes to incomesheet's storage design, and to aircraft data storage format.
- Changed the UI form validation library due to published CVE.
- Used aircraft market cleanup function did not run properly in the Age of Flight game.
- Fixed occasionally occurring cache file permissions issue at the backend scripts.
- Fixed missing airline alliance definition from bankruptcy function at Game Subscriptions page.
- Fixed a route editor's database issue occurring during new games' first day.
