This commit fixes the const correctness for cases where the
container would be const. It removes the const qualified versions
of the SpecificCircularAccessor as this object would always be non-const anyway.

curve: QuaternionBezierSpline and QuaternionSQUADSpline now support non-uniform segment proportions (smooth interpolation still guarantees C1 continuity)

geometry: fixed CGMeshFactory::createVolumeSignedDistanceField() for acute edges and corners (now uses angle weighted pseudonormals for correct distinction between interior and exterior points)

geometry: CGMeshFactory: fixed numeric problems for remeshing operator(surfaces parallel to grid) + added unit test remeshing a box (worst-case for numerics)

io: NetworkSocket: added virtual functions preProcessObjectToSend() and postProcessReceivedObject() to allow user to modify objects just before/after they are sent/received (e.g. to set timing flags)

io: JoyStick, Logger, NetworkSocket: removed 'final' specifier and changed various 'private' to 'protected' to allow extension by a derived class

geometry: SSVSceneData: added method setSegmentPose() for convenience and translateSegmentAndUpdate() for efficiency

CI: added exection of unit tests in debug mode and switched from debug to relase for coverage report

**New Features**
* [core]: Added EnumerableState as an extendable replacement for typed enums.
* [hwl]: New hardware layer module for real-time communication with distributed devices
* [memory]: Added ThreadSafeData template for storing protected data with support for guarded locks

minifix: PNMFileData: whitespaces now also count as characters (used to maintain maximum column count in ASCII mode)

cmake: added broccoli dependencies for examples (such that examples can be compiled stand-alone without the tests)