implement topmenu in idots template set
add idots preference to enable topmenu
add idots preference to disable general sidebox menu
some cleanups in idots framework class
some cleanups in egw_framework
- virtual baseclass egw_framework in the API which each template extends
- replaces $api/footer.inc.php, $tpl/head.inc.php & $tpl/navbar.inc.php
- all existing phplib template sets just inherit the idots_framework, but can have own templates
- moved most html from navbar.inc.php into the navbar.tpl
--> idots & jerryr are reworked and working, all other template sets are disabled at the moment
--> The rework was done to add a selectbox to add all sorts of entries without the need to change to the app first. This is now implemented in the egw_framework class using the link-registry.
