Squashed commit of the following:

commit f417887baba9da6df599de05de8eed8654465ddb
Author: Sean Davis <smd.seandavis@gmail.com>
Date:   Sun Aug 27 05:57:31 2017 -0400

    Add myself to AUTHORS

commit c520c520d8824f1c4f3a8c2c151b03a7440f40a8
Author: Sean Davis <smd.seandavis@gmail.com>
Date:   Wed Aug 9 22:39:41 2017 -0400

    Add ~ files to .gitignore

commit a5b8fb79ef52eb351552ff280c91c00b373fcb7e
Author: Sean Davis <smd.seandavis@gmail.com>
Date:   Wed Aug 9 22:38:46 2017 -0400

    Consistent spacing

commit e4c2db8f2337a8a4c10f98ff73f27e2ad1f52489
Author: Sean Davis <smd.seandavis@gmail.com>
Date:   Wed Aug 9 22:31:32 2017 -0400

    Port glade file to GTK 3.6

commit 9c4fee2ca0b04d771a2c3d6e7ca0db484d5d8fe3
Author: Sean Davis <smd.seandavis@gmail.com>
Date:   Wed Aug 9 22:04:49 2017 -0400

    GTK+ support through 3.22, ignore deprecations on essential functionality

commit b1f526ef5def96e4ea1e41b04feb59e1b52049c8
Author: Sean Davis <smd.seandavis@gmail.com>
Date:   Wed Aug 9 21:58:20 2017 -0400

    Silently discard const qualifier with pulseaudio-volume

commit b6eed1262a088c0c4e6008b66e7b2b68adaaba29
Author: Sean Davis <smd.seandavis@gmail.com>
Date:   Wed Aug 9 20:48:57 2017 -0400

    Remove default player, depend on broadcasting MPRIS2 players

commit 7aa7d42e98a2d469e77928c4697e31e6baaaf3e8
Author: Sean Davis <smd.seandavis@gmail.com>
Date:   Wed Aug 9 20:36:09 2017 -0400

    Fix intended icon size loading: GTK_ICON_SIZE_LARGE_TOOLBAR / 24px

commit f90850b2292a61483e8fdd89cc2557704a2d8e8f
Author: Sean Davis <smd.seandavis@gmail.com>
Date:   Wed Aug 9 20:15:21 2017 -0400

    Add mprismenuitem.c to POTFILES.in

commit 1760ea626025de6c853a5e8ae4b87324a5c01928
Author: Sean Davis <smd.seandavis@gmail.com>
Date:   Tue Aug 8 21:41:14 2017 -0400

    Better handling of stopped state, consistent status tracking

commit 11b9875bb6717b67b79a915809193e23b6f6b3e2
Author: Sean Davis <smd.seandavis@gmail.com>
Date:   Tue Aug 8 19:18:19 2017 -0400

    Drop unused properties and signals

commit b3b59527d5c7164a6246ac1623c4667aef9fd582
Author: Sean Davis <smd.seandavis@gmail.com>
Date:   Tue Aug 8 06:21:57 2017 -0400

    Sort players

commit a5b26216c3036d3f3e8525a73633b796b436a33b
Author: Sean Davis <smd.seandavis@gmail.com>
Date:   Tue Aug 8 05:34:28 2017 -0400

    Disconnect from MPRIS when menu items are destroyed, fixes another crash

commit a5268c8cf16805530e85c3751e90c797a19c4dec
Author: Sean Davis <smd.seandavis@gmail.com>
Date:   Sun Aug 6 12:10:46 2017 -0400

    Fix several crashes and build cleaner with debug enabled

commit a9248cd3ca2dd337c208f6dbbc6848c2e10df127
Author: Sean Davis <smd.seandavis@gmail.com>
Date:   Sun Aug 6 07:37:26 2017 -0400

    Consistent whitespace and const usage

commit 798f6101261eef6cc7b1545ed6cc5c73b98dcba6
Author: Sean Davis <smd.seandavis@gmail.com>
Date:   Sun Aug 6 06:54:04 2017 -0400

    Handle null string array

commit f5bd2e38082308854b4fe5e0fb68b3a297814b51
Author: Sean Davis <smd.seandavis@gmail.com>
Date:   Sat Aug 5 13:20:56 2017 -0400

    Add ability to raise or launch (launch crashes plugin) players

commit 358f862c332ee4e255cbc4309b78203be126112b
Author: Sean Davis <smd.seandavis@gmail.com>
Date:   Sat Aug 5 11:35:10 2017 -0400

    Fix crash on player exit

commit f856d67def5b6e81845ef35585d39bd2103d0b60
Author: Sean Davis <smd.seandavis@gmail.com>
Date:   Sat Aug 5 08:18:18 2017 -0400

    Add support for reverse domain name formatted launchers (Fixes integration with Parole)

commit 3797f7b37c885eab58da40a7799cc50128cb463e
Author: Sean Davis <smd.seandavis@gmail.com>
Date:   Thu Aug 3 23:50:55 2017 -0400

    Fix a few defaults, add storage for known players

commit 96c336661fb6832c63fba06c46abc46a4ba83b86
Author: Sean Davis <smd.seandavis@gmail.com>
Date:   Wed Aug 2 06:41:08 2017 -0400

    Add .gitignore

commit ce61a7725ad3eb362e9d0bdaf65ad9b0b66b0c7e
Author: Sean Davis <smd.seandavis@gmail.com>
Date:   Wed Aug 2 06:40:06 2017 -0400

    Add initial MPRIS2 support.
    This still requires some cleanup and a bit of refactoring, but should be at a usable point.

Defaults to 153% (pavucontrol reports 11.08dB)

Make the default mixer command a compile-time option and rename mixer
name to mixer command since it is interpreted a command which can be
optionally specified with full path and command line options.

Wired up a "mixer-name" property.

enable-keyboard-shortcuts property not yet working (?)