KLocale method for removing accelerator markers

[Chusslove Illich]

At places KDE code does <some_ui_label>.remove('&'), when a UI label needs
to be used without the accelerator marker. E.g. action text when used as
toolbar button label. However, this does not work in presence of escaped
ampersand ("Foo && Bar"), and, in particular, for CJK-style markers (
"&Open With..." -> "アプリケーションで開く(&O)...", where complete "(&O)" should be
removed as marker).

So far we encountered several places in kdelibs where accelerator marker is
being removed, and one in Gwenview and Konsole. It's possible to patch them
on case-by-case basis, but I think it merits a dedicated method of KLocale.
The patch attached. Units tests show desired behavior.

-- 
Chusslove Illich (Часлав Илић)
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