Add measure to base Meter class

Signed-off-by: James Tasker <james_tasker1@hotmail.com>
Add measures to skin config

Signed-off-by: James Tasker <james_tasker1@hotmail.com>
Add calcMeasure to UI

Signed-off-by: James Tasker <james_tasker1@hotmail.com>
Add min and max value to configs

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