Flint: Improve lima ROI display

This MR tries to improve the Lima ROI counter display in Flint in order to make it readable.

• Flint
  • Group channels by ROI name in the curve plot property tree
• BLISS
  • Update RoiCounters to return ROI ordered by name
  • Fix edit_roi_counters to use the sorted API
    • So reediting the ROIs do not change there order
  • A better approach would be to provide the list as it was provided
    • But HashObjSetting is not able to store key order