awesome: focus clients by direction
awesome: swap clients by direction
awesome: improve mwidget_icon, mwidget_arrow functions

mwidget_icon
* add vertical alignment

mwidget_arrow
* add spacing
awesome: improve widgets

* remove spacing in icons, this is now handled in functions
* change indentation to 2 spaces
awesome: add ability to configure mpd widget per host
awesome: fix date highlighting
awesome: improve <span> formatting in tooltips
awesome: tab -> switch to next client