* remote.c (remote_protocol_e, remote_protocol_E): Define.

* remote.c (remote_protocol_e, remote_protocol_E): Define.
(set_remote_protocol_e_packet_cmd)
(set_remote_protocol_E_packet_cmd)
(show_remote_protocol_e_packet_command)
(show_remote_protocol_E_packet_command): New functions.
(init_all_packet_configs): Initialize remote_protocol_e and
remote_protocol_E.
(remote_resume, remote_async_resume): Support e/E command
packets.
(show_remote_cmd): Show state of remote_protocol_e and
remote_protocol_E.
(_initialize_remote): Add "set remote step-over-range-packet"
and "set remote step-over-range-w-signal-packet" to CLI.
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