e_order: Added a function to check if this Efreet entry allready exists

Checks if this Efreet_Desktop entry allready exists in the given
E_Order.
ibar: Changed the key which is used to store IBar Icons.

Summary:
Changed the key to orig_path, cause this is used to decided if something
is a duplicated entry in e_orders or not.

Reviewers: zmike

Subscribers: cedric

Differential Revision: https://phab.enlightenment.org/D1684
set skip pager/taskbar hints on parent window instead of client window

this is a change in behavior as compared to E17-E18 where any setting of related flags would alter the client hints

ref T1692
remove xembeds from systray module
force shape queue on notification delete

fix T1801
ensure string safety on dbus message in connman agent

fix T1812
remove e_mod_xembed.c from POTFILES.in
clean up E ptrace detection and usage
detab e_start_main.c; spank spank spank