Added regions: Unity, IGazeListener, ICalibrationProcessHandler and moved methods repectably.
Refactored inconsistencies:
  private var: lowerCamel(mix of lowerCamel w/ _ prefix and UpperCamel with _ prefix).
  private const: UpperCamel
  method: UpperCamel.
Removed linq requirement. Needs further testing!
Added type safe Invoke in UnityGazeUtils
Moved namesspace to TET to avoid class name collisions.
Sorted & removed unused using.