FLUID-5043: Modified textSizer and lineSpacing

Removed the min/max range from the model into a range object in the options. Also, to be more closing aligned with the designs, switched to using just the fluid.textFieldSlider.slider component directly. The templates were also updated to remove the textField and specifics that were used by fluid.textFieldSlider. The fluid.textFieldSlider component was currently retained for anyone else who may be using it.
FLUID-5043: Added a starter schema.

Added a starter schema that will accompany and provide the default values for the starter enactors and settings panels.
FLUID-5043: Fixed the settings panels tests.

The settings panels tests had been testing textSizer and lineSpacing by changing the value in the textField. Now that this is no longer used, the tests were changed to trigger the slide event on the slider instead. The markup was also cleaned up to remove the textField from the test.
FLUID-5043: Fixed uiOptions tests.

Minor break in the uiOptions test because it was using the textField to retrieve the set value for the textSizer. Changed this to source the actual value from the slider widget.
Merge remote-tracking branch 'justin/FLUID-5043' into FLUID-5043