Add support for additional configuration paths

[lujjjh]

The configuration file will be located in the order below:

1. ~/Library/Application Support/linearmouse/linearmouse.json
2. ~/.config/linearmouse/linearmouse.json

This commit enables the use of additional configuration locations, including the standard ~/Library/Application Support path, to provide users with more flexibility.

The configuration file can now be located as follows:

1. ~/Library/Application Support/linearmouse/linearmouse.json
2. ~/.config/linearmouse/linearmouse.json (The original location)

To maintain backward compatibility and prevent any disruptions, new configurations will still be created in location 2.

Closes #644.

[ultratiem]

Apple guidelines dictate that any config files or files in general needed by an app install to ~/Library/Application Support. That is the standard and ubiquitous location for all application files on macOS.

macOS does not use hidden directories nor should it. Nor does it install to a users home folder. That is a Linux standard.

This commit leads to user confusion as now there are 2 config files. Moreover, the secondary location is not ideal as macOS users should have to look for hidden directories.

This commit should leave the correct location (~/Library/Application Support), and remove the .config folder entirely. There is almost no gain for a user to move config files or store them in another location. All this will do is add a layer of confusion and takes the app further away from one designed exclusively for macOS.

with respect.

[lujjjh]

Hi @ultratiem! Thanks for your feedback.

To clarify, this pull request marks the beginning of the migration of the configuration from ~/.config to ~/Library/Application Support. However, to avoid introducing breaking changes before the next major update, it is necessary to keep the original configuration path.