[Feature] Add an update-dots Script

[H0mire]

What would you like to be added?
Add an update dots script.
This Script should pull the git repo or reclone it (maybe in a temp folder) and update the dot files without touching the custom configurations.

It could also use checksums to identify files, that are manually changed and back them up, so that the user may restore specific settings.

How will it help
Instead of manually pulling the repo and doing backups to preserve configurations, add an update_dots script that automatically does the job.

Extra info
Checksums of the config files could be stored in a separate file, which will be compared with while updating the repository.

[H0mire]

Maybe it should also run some kind of "ensure-dependencies" to automatically install new requirements.