bump MSRV due to updated glib requirement

as mentioned in the previous commit, github is now issuing warnings for
ci actions that are usin...

github is listing warnings that indicate that the versions of 'actions'
that i'm using in CI nee...

forgot to remove `pa_v5` entry in 489edd5b1f9924c5d64af2bf9368608bba8da90e

i forgot to do this as part of the previous release. i already published
the new sys crates so w...

pkg-config checks performed by build scripts need to be disabled when
building docs on docs.rs. ...

warning: ambiguous glob re-exports
--> pulse-sys/src/lib.rs:58:9
|
58 | pub use self::conte...

example warning:

warning: using `.clone()` on a double reference, which returns `&str` instead ...

i was never quite satisfied with the way this was implemented and have long
meant to remove it.

glib crates now require 1.64

for some reason, having upgraded the OS environment to ubuntu 22.04 from
20.04, the tests were f...

forgot this upon bumping OS.

just because.

i missed this in the previous badge fix commit.

glib crate actually needs rust version 1.63 now, so the previous fix was
insufficient.

ref. https://github.com/badges/shields/issues/8671

as discussed in c6d5a9309b2fbc97cc3490dc04a5626e6d46c426, rust versions
1.60 and 1.63 tweaked fl...

note, this was the only change needed from PA versions 16.0 and 16.1.

version 1.60 of the rust stdlib included a change to improve the accuracy
of calculations in `Du...

while the new resolver may make no difference to this project, we may as
well migrate, and accor...

these are now included in the standard prelude in Rust 2021 edition.

this is now an error in Rust 2021 edition.

which of course requires an MSRV of 1.56.

to better express/enforce our MSRV.

according to the cargo documentation ([1]) this was only in...

the `glib` crate has bumped their MSRV to 1.56 so we must do likewise for
the overall workspace ...

cf. #47

pkgconfig 0.3.23 changes added a new error in the case of a probe
failure (see https://github.co...

...now occurring in scheduled run.

the step where we try to ensure pulseaudio packages are inst...

typical convention i believe is actually only for deref of raw pointers to
require an unsafe blo...

i meant to do this in 456709e61823ca377c368b6cc35ba1acdd85fda9 but forgot.

needed for the next commit.

i don't expect this to make any difference, but `transparent` is
more appropriate for the purpos...

this member, as documented, is a 'system clock time', thus should be a
`UnixTs` type rather than...

this does not actually make any difference, since we do not directly
pass the wrapper into any C...

don't mask the potentially useful hint as to the cause of the problem.

i picked the `Invalid` v...

pulseaudio generally uses the special value `PA_USEC_INVALID` to indicate
an invalid quantity of...

as stabilised in Rust 1.46 (our current MSRV), such that panics from failed
conversions due to o...

now that msrv has been bumped to 1.46 we can take advantage of enhanced
`const fn` support.

bitflags v1.3 has just been released which now requires 1.46. since 1.46 is
a year old, i think ...

damn, copy & paste mistake

i don't believe that users have any need to mutate these objects after
creation. a creation func...

having been playing with rustfmt, these are some initial adjustments that
i'm happy with.

(i'm just playing with rustfmt, not committing to use of it yet, with a
number of bugs filed aga...

rustfmt doesn't like the formatting, and this results in fewer lines. it's
better anyway.

Since the pointers have already been confirmed to be non-null by the
assert!() calls, there is n...

caused docs.rs build to fail.

the `glib` and `glib-sys` crates which the glib mainloop crates here depend
upon now have an MSR...

avoid the 'minimum' conditional logic; having the steps for that outside of
the loop results in ...

run a test at the beginning of the first day of every month, such that if
i'm busy working on ot...

it does not work to have these feature guards currently until rustc issue
#8811 ([1]) is fixed s...

note, the documentation change to `pa_proplist_get()` was already taken
care of in eea623f56ca69...

note, during PA v15 development, a `message-params.h` header was added,
but then replaced with `...

per: https://github.com/jnqnfe/pulse-binding-rust/issues/38

per: https://github.com/jnqnfe/pulse-binding-rust/issues/38

i don't think this ever needed atomics.

it was checked within the constructor as well as prior to constructor use.

current MSRV is 1.41, and without this fix the following errors occur after
the previous callbac...

- adding a conversion function param to the common helper enables that
helper to fully perfo...

overlooked updating pointing docs to new bitflag associated constants
locations when they were m...

to address important bugfix, a new version for the others can come later
with additional improve...

since the function was being imported from the sys layer, the deprecation
date from the sys laye...