Fix xfdesktop --reload in spanning mode (Bug 10853)

When issuing an xfdesktop --reload while in spanning wallpaper
mode, all the monitors would update their backdrop which means
the wallpaper of the last monitor would then be shown. This
fixes the logic to continue to show the wallpaper for the first
monitor as intended.
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settings: Fix background color loading

The issue was launching xfdesktop-settings changed the
wallpaper background color, either to black or #7f000 or
some other color.
There's a bit of a mixup in the code, there's color 2s where
there should be color 1s. With these corrected the colors
should properly be loaded and old versions should be migrated.
Bug reported to launchpad but never sent up to xfce's bugzilla:
https://bugs.launchpad.net/ubuntu/+source/xfdesktop4/+bug/1313728
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Hardcode the infobar label color (Bug 11100)

The GtkInfoBar hard codes the background color which makes the
label impossible to read with dark themes. This patch hard codes
the label's color so you can read it with any theme.
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--enable-debug option added to xfdesktop-settings
Fix icon loading for .desktop files (Bug 11078)

This code now checks multiple different ways that an icon can be
declared in a desktop file. It checks the absolute path, if it's
in the icon theme, if it's in the icon theme without an extension,
and finally if the icon is in the pixmaps folder.
Don't show infobar when there's only 1 workspace (Bug 11134)
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Remove the drag highlight code (Bug 10450)

When dragging icons on the desktop there was a box showing which
cell the icon was going to be placed in. The issue is that the
bounding box doesn't always get cleared and ends up causing
different artifacts on different systems. For now, remove this
feature until it can be correctly implemented.
Updates for release.
Post release tag bump.
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Add a space between icons to fill the entire screen.

Signed-off-by: Eric Koegel <eric.koegel@gmail.com>
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