Simplify code by using shared string constants using bool (0/1) index,
!!-operator and negation-via-XOR.

Future optimization: Preallocate and re-use of iterators, to avoid
repeatedly allocating and freeing of memory.
Signed-off-by: Stefan Knoblich <stkn@openisdn.net>

Keep the original iterator around to be able to actually free it
after use.
Signed-off-by: Stefan Knoblich <stkn@openisdn.net>

Part of my ongoing effort to split ftdm_io.c into more manageable pieces.

This change (along with others in the future) allows decoupling of the
span registry and its users, in preparation of moving all span related
functions and data structures into ftdm_span.c.
Signed-off-by: Stefan Knoblich <stkn@openisdn.net>

FS-5449: --resolve add a mod_commands function to use the shell escape function and update the existing function to use correct escaping

    adds a pool based implementation of the switch_util_quote_shell_arg function and changes existing function to be a wrapper around the pool based one

Zero-filled, but never used otherwise (and static), drop it.
Signed-off-by: Stefan Knoblich <s.knoblich@axsentis.de>

We kill these files with .gitattributes.

We now build unimrcp, portaudio, portaudio-stream, skypopen, b64, and
dahdi-codec, so they should be included in meta-all.  Also refactor a
bit so we install all lang and mod_say packages as well.

Without setting errmsg to NULL here, we'll try to print this freed
value again below if another error doesn't intercede.

Not that it really matters since we're returning to the OS momentarily
at that point anyway.