Create basic RoundlineMeter class

Signed-off-by: James Tasker <james_tasker1@hotmail.com>
Add LineColor property to RoundLine meter

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

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