Code review comment for lp:~macslow/notify-osd/fix-396736

Replaced GScanner with GRegex to parse the font-name/style/size obtained from gconf. This corrects parsing the full string. Before a font like "Courier New Bold 10" was only interpreted as "Courier" with size 10. Rendering title- and body-text has also been adjusted to take advantage of this. Now that the full name and style are correctly parsed LP: 396736 is fixed too.