Bump version to 5.8 (to match breeze-gtk)

# Conflicts:
# Breeze-gtk/CMakeLists.txt
# Breeze-gtk/gtk-2.0/Buttons/button-prelight.png
# Bree...

Currently, even if the theme was updated, CMakeLists.txt would still
pick data from an old "gtk-...

Update for the breeze-gtk theme mainly for gtk-3.20 but also some
bugfixes for older gtk version...

This regession is introduced in this commit:
https://quickgit.kde.org/?p=breeze-gtk.git&a=commit...

# Conflicts:
# Breeze-gtk/CMakeLists.txt
# CMakeLists.txt

`(gtk3-demo:5797): Gtk-WARNING **: Error loading image
'file:///usr/share/themes/Breeze/gtk-3.0/...

Summary:
they have no use in production environments and only consume resources for
no good reas...

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REVIEW: 126477

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REVIEW: 125977

Firefox is using colors from ACTIVE palette in scrollbars,
which makes it darker.

REVIEW: 125980

Not specifying state in style makes that style used for all states.
This made the arrows always ...

REVIEW: 125811

REVIEW:125814

This is helpful on a multiarch layout where the prefix is /usr/${host}
but arch-independent file...

Made the wording slightly more precise.

Reformatted and reorganized some information.

Less verbose local theme installation location.

Fix chromium/chrome frame

Clarified and simplified installation instructions.

added simple install instructions

On Breeze-dark this was very obvious, on regular Breeze, you might not
notice since the color di...

Set the same color for links in the gtk-2 theme as in the gtk-3 one

Small cleanup + repicked tooltip colors

Fixed tooltip color

All images are now in a single svg file

Correction of a small spelling error.

Clarified pixmap engine requirement.