0.4.0

Changes:

• Remove point turns and wait segments (look here for a turn replacement)
• Reorganize path classes
• Add trajectory splicing (interrupting an in-progress trajectory and smoothly transitioning into a new one)
• Add spatial and temporal markers to trajectories
• Standardize epsilons
• Add new projection algorithm and remove ProjectionResult
• Add new arc approximation algorithm for spline arc length parametrization and length calculation