Replace font colour textbox with colour picker form

Signed-off-by: James Tasker <james_tasker1@hotmail.com>
Make aboutbox a fixed size

Signed-off-by: James Tasker <james_tasker1@hotmail.com>
Make measure editor widget anchored to the right

Signed-off-by: James Tasker <james_tasker1@hotmail.com>
Add basic LineMeter class

Signed-off-by: James Tasker <james_tasker1@hotmail.com>
Remove unnecessary test code

Signed-off-by: James Tasker <james_tasker1@hotmail.com>
Correct default bar meter name

Signed-off-by: James Tasker <james_tasker1@hotmail.com>
Add ability to create new line meters in main GUI

Signed-off-by: James Tasker <james_tasker1@hotmail.com>
Add drawing of line data

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