Allow quterofi to read toml files from any user provided location

[cortsf]

Allow users to provide a --quickmarks_file optional argument (defaulting to the standard QB file) when calling quterofi/set_quickmarks, quterofi/manage_quickmarks and quterofi/open

Support for standard quickmarks file/s is being deprecated in favor of quteromarks. Allow users to provide a custom path to the toml file, or a list of paths such that the user can organize engines and quteromarks in multiple files. This approach have the disadvantage of having to force users to specify which file to operate on when using quterofi/quteromarks to manage quteromarks. And of course, the undesirable layer of noise in the code base.