LaunchBar: center the icons on the launchbar

Signed-off-by: Christophe Chapuis <chris.chapuis@gmail.com>
Launcher: Implemente drag'n'drop reordering of the full launcher

Signed-off-by: Christophe Chapuis <chris.chapuis@gmail.com>
Merge pull request #129 from webOS-ports/tofe/work

Tofe/work