Matter should set up its own installation files

[mateosss]

Currently, the user is asked to download the folder to a "safe" location and then run the script. Instead, the installation directory should be handled automatically by matter without requesting the user to be careful. Issues like #67 occur because of this.

An idea for improving Matter installation would be to do something like other command-line utilities and provide an installation script, something like wget -qO- https://raw.githubusercontent.com/mateosss/matter/v1.2.1/install.py | python3

And then make the current matter.py utility just a matter command in the user PATH.

Another idea would be to make Matter installable through pip like grub2-theme-preview.