Fix bug when seeking in queues
prop: Avoid creating unnecessary properties during unlink
prop: Improve trace
prop: Fix broken symlink unlinking in prop_destroy0()

We need to unlink symlinks before we decend the tree

Fixes #2107
skin: Remove some actions in page menu if the would have no effect

Such as: Go to settings,home,playqueue if already at the page

Also remove the ability to bookmark home page. It makes no sense

Fixes #2112