Changes to the Configuration object to properly handle radio actions as well as toggl...

Changes to the Configuration object to properly handle radio actions as well as toggleactions.  Then add Monitoring, Meter falloff, and Meter Hold under the options menu to the Configuration object, so that they will now be saved and recalled between ardour startups as non session specific items.  Also, ardour.rc will be saved now on exit of ardour, wether or not session is saved.  Also some text and color tweaks

git-svn-id: svn://localhost/trunk/ardour2@542 d708f5d6-7413-0410-9779-e7cbd77b26cf