ftmod_isdn: Port(/Fix) span signal handling, remove some dead/unused pieces and close the D-Channel on shutdown.

This fixes a NULL-call segfault in ftdm_span_trigger_signal().
Signed-off-by: Stefan Knoblich <s.knoblich@axsentis.de>

I really need to dig deeper here, some libpri events never fire for
incoming calls and i'll have to find out how mod_freetdm or the
FreeSWITCH core change states on the channel...

Anyway, incoming and outgoing calls still work for me (BRI PTMP TE),
so commit this now and let a wider audience do some more testing.
Signed-off-by: Stefan Knoblich <s.knoblich@axsentis.de>
Tested-by: Stefan Knoblich <s.knoblich@axsentis.de>

ftmod_pritap: Abort before overflowing spanparameters array and initialize to all zero
ftmod_isdn:   Fix overflow check, skip over parameters without name or value, initialize spanparameters array to all zero.
ftmod_libpri: Skip over parameters without name or value, initialize spanparameters array to all zero and drop "i < 10" hardcoded check.

This should fix:
	2010-11-15 09:24:34.609515 [ERR] ftmod_libpri.c:1741 Unknown parameter '', aborting configuration
	2010-11-15 09:24:34.609515 [ERR] mod_freetdm.c:3080 Error configuring FreeTDM span BRI_1
Signed-off-by: Stefan Knoblich <s.knoblich@axsentis.de>
Reported-by: Ingmar Schraub <is@eseco.de>

Signed-off-by: lakshmanan ganapathy <lakindia89@gmail.com>
Reviewed-by: Stefan Knoblich <s.knoblich@axsentis.de>

Preparation for fixing channel handling for BRI PTMP (Point-To-MultiPoint) setups.
Signed-off-by: Stefan Knoblich <s.knoblich@axsentis.de>

freeswitch: Update .gitignore file (libcodec2, esl binaries, mod_hash + mod_osp autogenerated files)
Signed-off-by: Stefan Knoblich <s.knoblich@axsentis.de>

Signed-off-by: Stefan Knoblich <s.knoblich@axsentis.de>

freetdm: Add ftdm_channel_get_state(), ftdm_channel_get_last_state() and ftdm_span_get_trunk_type_str().

Remove custom versions from ftmod_isdn and ftmod_libpri.
Signed-off-by: Stefan Knoblich <s.knoblich@axsentis.de>

Signed-off-by: Stefan Knoblich <s.knoblich@axsentis.de>

Signed-off-by: Stefan Knoblich <s.knoblich@axsentis.de>

"if (ftdm_array_len(spanparameters) == paramindex)" is still off-by-one,
we want to stop at "ftdm_array_len(spanparameters) - 1", before we overwrite
the last (= terminating, NULL) element.

NOTE: i'd prefer an "argc, argv"-style interface here
Signed-off-by: Stefan Knoblich <s.knoblich@axsentis.de>

mod_freetdm: Avoid overflowing the spanparameters array of libpri spans, and make other span types use ftdm_array_len() too.
Signed-off-by: Stefan Knoblich <s.knoblich@axsentis.de>