Update .screenz and .temp paths to safer paths. Set default cache path.

[Throone]

Haven't actually tested this in full yet. But as long as vim played nice this should work.
*edit used vim's substitute command

[Throone]

Need to add an unset cache at the end of the file, will do when I have access to a computer.

[Throone]

To clear up the changes made:
~/.temp was moved to the /tmp directory and renamed to screenz-tmp.
~/.screenz was moved to the ~/.cache/screeenz directory and renamed to parameters.

A short if/else statement discovers if the users uses XDG_CACHE_HOME and will change the default path of parameters to that instead. This was added to the top of the script.

[Kolbo5]

Hello !
Nice update ! I get this branch until it's merged in main repo.
Just one thing : you could update the README too (generates a hidden file => generates a parameter file and above)