Add an auto updater

[SuperFola]

Something among the lines of ark -u|--update to download the latest ark release and use it instead of the current version

[SuperFola]

We should standardize our installation paths to make the work of the updater easier.

Something like C:/Program Files/arkscript/ on Windows, and /usr/local/bin/arkscript on Linux/macOS

[SuperFola]

IMHO this is something that should be achieved through package managers, like pacman or brew.