[Merge] ~muktupavels/compiz:remove-unused-or-broken-buttons into compiz:master

[Alberts Muktupāvels]

Alberts Muktupāvels has proposed merging ~muktupavels/compiz:remove-unused-or-broken-buttons into compiz:master.

Commit message:
window-decorator: remove shade, stick and above buttons

Requested reviews:
  Compiz Maintainers (compiz-team)

For more details, see:
https://code.launchpad.net/~muktupavels/compiz/+git/compiz/+merge/380888

window-decorator: remove shade, stick and above buttons

1) These buttons are not supported by builtin Cairo theme and Metacity will remove these buttons in next version.

2) These buttons are not supported by client side decorated windows.

3) Few Metacity themes I checked had no icons for these buttons. They had empty draw_ops...

Functionality itself is not removed! Still available using window menu and/or keybindings
-- 
Your team Compiz Maintainers is requested to review the proposed merge of ~muktupavels/compiz:remove-unused-or-broken-buttons into compiz:master.
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