Custom time stamp format

[nurupo]

Allow users to set a custom time stamp format. Make so that time stamps older than a day have a day/month/year specified, format of which should also be customized.

This issue consists of two parts:

1. Implementing a settings page / adding to an existent settings page.
   • Can be done now.
   • Use QDateTime's format.
2. Implementing time stamp changing in the Message Display (on settings change and on day change).
   • Requires Reimplement Message Display widget #62 to be completed first.

[Schlumpf]

@sometwo
I implemented something like your 4chanX example in the new messageview.

Relative:
Do you mean, that all timestamps should update every second?