Chump, change, and it's on, super bon bon

A few small improvements to a small utility.

• ALT-T can be used to open up the package template in a browser. This assumes the pkgname value from xbps-query is the name of the template in the git repository.
• The desktop file now categorizes fuzzypkg as a System program.
• Launchers can now pass user input to fuzzypkg.
• Package details on the main screen can now be shown/hidden with a short cut key (ALT-D) and by default in the configuration file.