Add tooltips to editor icons

[karls0]

Bug Description no tool tips for editor icons are shown when mouse over

Steps to Reproduce

1. hold mouse pointer over editor-icons like B, I, undo, markers, ....

Expected behavior tool tip should pop up

Device information

• QPrompt Version: 1.1.6
• Operating System: Linux Mint 22

[Cuperino]

Developer note, see: https://doc.qt.io/qt-5/qml-qtquick-controls2-tooltip.html