(Fix/Feat/Refactor) Installer|Functions|Database|Settings

[AGuyNamedJens]

This PR Modifies 14 files; by refactoring, fixing bugs and adding new features:

Installer.php for first-time setups:

• Fixed API Calls
• Fixed Database modification requests
• Fixed encryption to match the encryption used by the database
• Fixed deprecation warnings, changed several checks and functions

• Added debug logs

  Functions.php:

• Adds encryption and decryption functions
• Refactor and Typedoc everything
• Modified environment functions to work properly
• New, renamed, refactored and removed functions

• Added debug logs

  Index.php:

• Refactor, visual improvements to the codebase. No actual code changed.

  Settings controller:

• Refactored validation rules to match input options

• Refactored variables to match validation rules

  Removed the main_site from the database since it's no longer used

[IceToast]

LGTM, please check if the logging works. Can be merged if it does

[AGuyNamedJens]

@IceToast Modified quite a bit again, please check if it's good 💯