Animated homescreen rotation

When the homescreen changes from landscape to
portrait mode (and vice versa), animate the angle.
App Launcher: 4-column layout

Make grid tiles smaller horizontally to fit 4 icons
(instead of 3) onto the screen (assuming N950 screen).
Move WallClock to MainScreen to be shared globally

We want to use the WallClock in more places than just
the lock screen, so move it into MainScreen.
Favorites screen: Use WallClock, layout and color fixes

Use global "wallClock" object in MainScreen instead of
static JS Date object.

Fix layout and colors to look more like in Harmattan.
Remove background, tab bar, add favorites screen

This removes the background image (improves scrolling
performance, as the background + semi-transparent black
overlay don't need to be drawn) and tab bar, and adds
the favorites screen as first item in the pager.
Use Qt Components for orientation and status bar
App switcher: Use close button image from theme
Close mode in app switcher

Same as in Harmattan:

 - Longpress to show close buttons
 - "Done" and "Close all" buttons
 - Abort close mode when scrolling out of view
 - Abort close mode when closing last window
Always show status bar (even in lockscreen mode)
Make AppLauncher the initial view on startup
Reveal content behind lockscreen via fade and scale

Again, very much inspired by Harmattan's UX.
Remove StatusBar hack (not needed anymore)

With new qt-components with w00t's patch applied, the
status bar rotation information is correctly applied.
Merge pull request #9 from thp/harmattanize

Various changes to make the homescreen look nicer