a) persist whether the end marker should move at first capture in the session file

a) persist whether the end marker should move at first capture in the session file
b) prevent transport motion if stop-at-session-end is true
c) ensure that (more) menu items that provide control over Configuration object options are in the correct state at startup
d) Configuration options removed from "have a session" sensitivity toggling
e) removed functionally empty default_keys.cc

git-svn-id: svn://localhost/trunk/ardour2@433 d708f5d6-7413-0410-9779-e7cbd77b26cf