Only show track actions if we have a selection


git-svn-id: http://cantata.googlecode.com/svn/trunk@5261 b1e49159-3266-923f-9c3e-04f16369770a
Fix reading of playqueue, and context, backdrop settings.
BUG: 525


git-svn-id: http://cantata.googlecode.com/svn/trunk@5262 b1e49159-3266-923f-9c3e-04f16369770a
Capitalise composer, if appropriate, too


git-svn-id: http://cantata.googlecode.com/svn/trunk@5263 b1e49159-3266-923f-9c3e-04f16369770a
Larger icon


git-svn-id: http://cantata.googlecode.com/svn/trunk@5264 b1e49159-3266-923f-9c3e-04f16369770a