Leading zeros for time display.

Time is now shown with leading zeros.

7:9 is now 07:09
10:5 is now 10:05
Added toggle for padding the time with zeros.

Added the option 'gt zeros [on/off]' to enable and disable padding the time with zeros for nicer formatting on screen. This is also read from the config and requires a change to the settings.xml.
Merge pull request #1068 from Skyrant/patch-1

Leading zeros for time display.