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Release the monitor lock when calling the provider start/stop methods.
Because we release the lock now, We need to make sure we check the
cookie again and keep track of started and removed providers.

The deviceproviders are added to the array sorted by their rank. Make
sure we keep this ordering when removing a provider.

We use _prepend to collect the devices, use g_list_reverse to get the
devices in the right order; sorted by rank and in the same order as
returned by the provider.

So from this point, the remaining warning for libgstreamer are about
protected member not showing in the doc. This may need some discussion
with upstream gtk-doc people.

* Remove % in from of none macro
* Fixed GST_TYPE_FAGS -> GST_TYPE_FAG_SET
* Minor wording fix
* Can't link to GstUri.port, so split the .port part

TRUE is 1, but every other non-zero value is also considered true. Comparing
for equality with TRUE would only consider 1 but not the others.

Also normalize booleans in a few places.

https://bugzilla.gnome.org/show_bug.cgi?id=735975

https://bugzilla.gnome.org/show_bug.cgi?id=732534

We dont't want to depend on GLib 2.34 for now.

Just show all devices then.

Each filter will include a GstCaps and a set of classes to match

Fixes criticals at runtime and makes stuff actually work.

Should fix build issues on BSD

Instead of having strings & flags, make them just strings

https://bugzilla.gnome.org/show_bug.cgi?id=678402

https://bugzilla.gnome.org/show_bug.cgi?id=678402