* AppResources: added optional parameter replacement to getString().
* Exercise Viewer - Track Panel: implemented setup of the axis type choice boxes.
* Exercise Viewer - Track Panel: initial implementation of the diagram chart.
* Exercise Viewer - Track Panel: axes names and diagram tooltips display localized enum names.
* Exercise Viewer - Track Panel:  update diagram on axis type selection changes.
* Exercise Viewer - Track Panel:  update diagram on axis type selection changes.
* Exercise Viewer - Main Panel:  update diagram heartrate range selection changes.
* Maven: added dependency for custom build of JFreeChart with JavaFX support.
* Exercise Viewer - Diagram Panel:  using JavaFX version of JFreeChart.