Add basic StringMeter with adapted config but no parameters

Signed-off-by: James Tasker <james_tasker1@hotmail.com>
Add Text property to StringMeter

Signed-off-by: James Tasker <james_tasker1@hotmail.com>
Add ability to add StringMeter to skin

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