ToolTip: Add textFormat property

Kai Uwe Broulikrequested to merge
work/kbroulik/tooltip-format into master

Allows to specify textFormat, particularly force PlainText.

Wish we had that upstream. Though a ToolTip can have anything as contentItem, so not sure we could have this upstream… let’s have it in Plasma Components at least.

Want this for !1194 (merged)

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