Rename SparkRenderer.renderScale to focalAdjustment. #113
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Also added to constructor options for initialization and to docs. Included note about how it's similar to the same
focalAdjustmentparameter in MKellogg, and that a value of 2.0 matches the calculations in the PlayCanvas engine.This PR subsumes #102 by providing a parameter that people can use to adjust to their liking. This potentially fixes #99 but it will be up to the user to decide if these tweaks are enough to match their expectation.