Add dedicated page for graphing stuff

Add dedicated page for graphing stuff

Needs work. Would probably make professional web developers cry.
Can plot things. Can set time ranges to plot. Can plot things vs other things.
Seems to work.

The Actuator data needs to include 2 points every time it changes so that the
fact that it is stepping discretely instead of linearly changing is apparent.

Also data to plot can probably be updated rather than recreated every time.
(Unless the variables to plot are changed).

Lastly, it would be good if things maintained their colours.

Someone *cough* should make the radio boxes and check boxes suitably stylish.