For proper GenericName.

- xfce settings: Change icon theme Simple -> SimpleSL.
- slideshow: Update Slide_Simply7_spring_2013.png.
- Replace stardict-gtk.desktop with stardict.desktop.
- menu: Add glchess.desktop.
- grub and gfxboot: Change seleted menuitems colour.
- grub: Update menu position.
- menu: Fix GenericNames.
- menu: Hide X-XFCE-SettingsDialog category.
- menu: Show Generic names by default.
- plymouth theme: Update scale factor for new logo.
- Update boot images.
- menu: Drop not needed desktop files.
- plymouth theme: Use scaling for logo.
- Update groups/firewall.png for alterator (tnx cas@).

200Mb -> 512Mb.

No localized GenericName in the package.

For new background.

And drop all desktop files: no use of them, just hide whole category.

Instead of SL-specific desktop-file with redefined names
just show Generic names. This in most cases will be enough.

Desktop file in the packages will be good enough.

- Set status 'beta'.
- Fix perms for acc group icons.
- Add groups/firewall.png from Centaurus.
- Update backgrounds.
- Don't package theme.plymouth.in file.
- plymouth: Replace progress bar with appearing logo.
- Fix grub text colour.
- Install *.png backgrounds too.
- gfxboot: Fix font color.
- Update wallpaper.png.
- Set new default background.
- Add new wallpapers.
- New slideshow.
- Replace gtk2-theme-simplicity with gtk3-theme-clearlooks-phenix.
- Update boot images.
- Drop parts of old Centaurus branding.
- Change theme to Clearlooks-Phenix.
- xfce settings: Suspend on lid close in case of AC too.
- Fix grub fonts and colours.
- Fix sysconfig-base installer step icon.
- xfce settings: Lock screen when going for sleep.

For 'firewall' category in the acc.

Backgroud without "Simply Linux" string and
new 1920x1080 background.

See #26894.

Use sysconfig-language.png as sysconfig-base.png.

There is separate from xfce4-power-manager settings for
xfce4-session now.