Add new actions to %Tp (Touchscreen areas)

Add the following actions to %Tp:
createbookmark   create a new bookmark from the wps
listbookmarks    list bookmarks from the wps
trackinfo        show track info from the wps

My main motivation was to allow bookmarking and jumping around audio books
from the wps on touch enabled targets.  You can do it now through the context
menu but it requires 4 screen presses instead of 1.

Change-Id: I1fa1bf0064dfd22b897eca7c56acc1ce8956f14c
Reviewed-on: http://gerrit.rockbox.org/171
Reviewed-by: Jonathan Gordon <rockbox@jdgordon.info>
4 files changed