Descriptor initialization reduces risk of mismatch between array size
and element initialization. It also improves code readability by
separating the parameter descriptions separate from the code that
composes the enum constraint structures.

As a side effect this commit makes the self-connect-mode constraint
allocated in dedicated memory chunks, like others enum constraints.

It was introduced before the parameter was actually exposed.
The parameter is exposed through a char type in both jackd and
jackdbus, thus a mappnig was required.

This changeset removes the enum and makes the code simpler
at the expense of not allowing arbitrary chars as values.
As it is exposed and used in sessions, it is not arbitrary anyway.

The bug was present in the inital version of the code,
commit 606609f9b5

There was no memory corruption because while
jack_driver_param_value_enum_t is smaller by 72 bytes than
jack_driver_param_constraint_desc_t, for ranges of non-string values,
the last 124 bytes are not used.

Thanks to Robin Gareus.
https://github.com/jackaudio/jack2/issues/17

This changeset is required for proper jackdbus handling of
parameters. jackd handling of parameters is improved by making
driver/internal parameters order on commandline irrelevant. E.g.
"jackd -d alsa -d hw:Intel,0 -P hw:Intel,3" should now give same
result as
"jackd -d alsa -P hw:Intel,3 -d hw:Intel,0".

The code used to create the driver parameter list in
jackctl_parameter_set_value(). Apart from the ordering problem,
the old implementation was not properly handling reset of
driver/internal parameters, because upon reset the parameter was not
removed from the set_parameters list which is supplied to
driver/internal.

This commit shifts driver/internal parameter list composition just
before it is needed. I.e master or slave driver open, switch master,
or internal load. The order of parameters is ensured to be the one
defined by the driver/internal.

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jackd and jackdbus defaults values for parameters should match
realtime mode became default for jackd
in svn r3791 (git commit 2cbaece993)

this changeset moves the default to control api

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