CodeAssist: Display rich text tool tips

Regression introduced by

    commit 2d70c2e2123c73ad8235ec1f06fd785f731dfdc7

Task-number: QTCREATORBUG-11854

Change-Id: I20f5b686b249059ea01e17d9ef4d61c52155b98c
Reviewed-by: Erik Verbruggen <erik.verbruggen@digia.com>
Debugger: Use tested offsets in QDateTime dumper

Task-number: QTCREATORBUG-11164
Change-Id: I9184e2f14baa3d3d649839f25088dbd0a01a3496
Reviewed-by: Christian Stenger <christian.stenger@digia.com>