Add Histogram Meter

Signed-off-by: James Tasker <james_tasker1@hotmail.com>
Allow creation of HistogramMeters in UI

Signed-off-by: James Tasker <james_tasker1@hotmail.com>
Add MemoryMeasure

Signed-off-by: James Tasker <james_tasker1@hotmail.com>
Add ability to create MemoryMeasures in UI

Signed-off-by: James Tasker <james_tasker1@hotmail.com>