In order for the program to close somewhat cleanly, it now catches the
signal and deletes the temporary file and folder before quitting.
Also the temporary files have been renamed to have meaningful file names

This car is cute and all but on an operational standpoint it's not
practical and even on my own computer with fonts that handle these kinds
of characters, the car doesn't display in htop.

This reverts commit 709fd61.

This allows to not break custom blockstores and allow at the same
time clean kill signal handling.