Remove some unnecessary user interactions and check for Data directory.

[HereInPlainSight]

A few quick changes to slightly ease use.

• User no longer has to click 'OK' when the wineprefix is created.
• Added -q flag for winetricks requests to install silently. Or, at least, without any user input required.
• I had an issue where the data directory didn't exist. It checks that now and creates it if necessary.
• Last minute commit: make script executable.