ENH: Fix 3943 and other enhancements for slice view annotations

• Fixed 0003943 by replacing DICOM study date and study time with series date and
  series time.

• Moved slice view annotations settings gear from Data Probe small widget (main
  screen) to the Data probe module in order to preserve more screen real
  estate for the module UIs.

• Fixed problem with color scalarbar range labels.

• Added an option to change format of color scalarbar range label
  and save the user settings in application settings.

• Change ruler text font size and family according to other text
  annotations.

• Removed the settings gear

• Store previous status of ruler and colorscalarbar after enabling
  slice view annotations

From: Alireza Mehrtash <mehrtash@bwh.harvard.edu>

git-svn-id: http://svn.slicer.org/Slicer4/trunk@23981 3bd1e089-480b-0410-8dfb-8563597acbee