Install a sample config file, besides the normal one.
Select correct theme on installation.
Convert clock into a seperate component.
Remove dependency on QtWidgets when compiled with Qt5.
Start a seperate process for the gui only in Qt5.
Reload configuration on every loop.

This is specificially needed for the Qt5 mode, because we start the GUI
in a seperate process which updates only its own Configuration instance
and main instance remains unmodified. When GUI is in the same process,
as in Qt4 mode, this problem doesn't exist.
Move clock properties into its own file.
Merge pull request #13 from rshah/master

implemented combobox widget. Fixes #5.
Update TODO.
Fix memory leak.

Found by cppcheck.
Close user interface after login process started.
ComboBox: Select correct item on startup.
Fix typo in copyright headers, add missing copyright info where missing.
Fix another typo.
Provide a user model to the themes.
Fix typo in the copyright headers.
Replace caret icons with chevron icons.

Chevron icons look better esp. within the combobox.
Add ability to set a cursor theme on startup.
Add faces to the users.
Add install instructions.