Improvements Live-Editing / Text-Reflow

Several Improvements: * Whitespace is added, when two segments in a multiline-textfield are joined directly together * Whitespace is added between segments when the whitespace-rendering of multiline fields is switched in case it is edited/changed * All orphan hyphens "-" that are not part of a segment are replaced with a blank when a textfield is edited/changed. This avoids the "accumulation" of hyphens after the segments. Since a textfield in the visual review may contains more than one segment, the "orphan" hyphens of the other segments will be replaced with blanks as well.