Drop brightness-lcd-missing icon

There is no more reference to it in the code, hence it isn't
used anymore anywhere.
Add icons for keyboard-brightness notifications
Add new display brightness icons and drop unused sizes

The new icons are more consistent (in color and style) with Gnome/Adwaita
and the new keyboard brightness icons.
Improve brightness icon for bright backgrounds
I18n: Update translation pl (96%).

188 translated messages, 7 untranslated messages.

Transifex (https://www.transifex.com/projects/p/xfce/).
Set the size of the brightness icon in the panel plugin menu to 32px

This makes it consistent with the device icons in the same menu.
I18n: Update translation it (85%).

167 translated messages, 28 untranslated messages.

Transifex (https://www.transifex.com/projects/p/xfce/).
Fix the version number output on the commandline

This was broken in commit 216a5b75 by moving the forking before printing
the version string.
Don't continue to ask to start xfpm if the user cancels

If xfpm isn't running when the settings app is launched, a dialog
pops up asking if the user would like to launch xfpm. If the user
clicks cancel on that dialog, the dialog pops up again (and again).
This patch changes it so that it won't nag the user over and over.
Use generic icon-names for the devices

Draw the progressbar indicating the load-status of the devices
with cairo, eradicating the need for an icon per load-status.
TODO: Add the same drawing routine for the devices tab in the
settings manager.
Fix build error and make variables C89 compliant
Drop remaining device status-icons
Merge remote-tracking branch 'private/progressbar'
Say goodbye unused code

This code was commented out in a commit back in 2010-08-12:
http://git.xfce.org/xfce/xfce4-power-manager/commit/?h=xfce-4.10&id=17f616d957f6ab7be0d61487babb582b53ed2459
It's not going to make a comeback so let it go.
Remove old CPU freq stuff

We don't do CPU frequency management anymore, remove the lingering
code.
Plugin: Rename to Power Manager Plugin

Since the brightness plugin merged with the battery plugin,
rename it to Power Manager Plugin. Also since we support
LXDE we'll stop calling it the Xfce Power Manager Plugin as
a LXDE plugin.
Update POTFILES.in
Tweak the devices-progressbar in the panel-plugin
I18n: Update translation es (100%).

195 translated messages.

Transifex (https://www.transifex.com/projects/p/xfce/).
I18n: Update translation fr (100%).

195 translated messages.

Transifex (https://www.transifex.com/projects/p/xfce/).