* Removed repeated calculation.
* Centralized the radius used to plot points and draw lines within GraphUtil.kt.
* Updated the signal metrics chart to use the scroll features.
* SignalMetricsChart long method warning suppression.
* The battery line is only drawn from point to point when we don't have a significant break in time.
* Implemented GraphUtil.plotPoint
* Implemented GraphUtil.createPath
* Added licence to GraphUtil.kt.