Icon sizes are stored as a zoom percentage. This may need to be updated
by a programmer with better ideas, but it seems a bit nicer than storing
the size in pixels and presenting that to the user.
`ctrl` + `h` toggles the visibility of hidden files and folders per tab.
The per tab option overrides the global option. So, a user may set
hidden items to be visible by default (global option) but override it
per tab with `ctrl` + `h`.
Currently, per tab options aren't presented anywhere in the UI such as a
menu, so the hotkey is the only way to use this feature for now.
A tab config is useful for allowing users to show hidden files, sorting
by different metrics such as size or MIME type, as well as providing a
way to implement some of the todos such as configurable icon sizes for
views.
