Improve how settings are handled

[Nimaoth]

Currently settings are not declared anywhere, the code just uses them by specifying the name and a default value using

getOption[int](configProvider, "editor.max-search-results", 1000)

Problems:

• No place to put documentation for settings
• No easy way to get complete list of settings
• No auto completion/name checking when compiling

The new system should allow the following:

• Declare builtin settings in one place or multiple places but grouped by scope
• Specify documentation, type info etc. for each setting
• Allow plugins to declare their own settings
• Get compiler to check correct usages of builtin settings in compiler source and plugins
• Still allow accessing settings using string path

Once that is done a finder can be implemented similar to browse-keybinds to explore all available settings