MotionPath: code enhancement

[capdevon]

Optimization and Refactoring:

1. Consolidate createLinearPath() and createCatmullRomPath(): These methods are almost identical. They can be merged into a single private helper method that takes the curve detail as a parameter.
2. Refactor setPathSplineType(), setCurveTension(), and setCycle() debug node update logic: The logic to remove, clear, and re-attach the debug node is repeated. This can be extracted into a private helper method.
3. Re-ordering of methods for better readability.

Javadoc Grammar and Style Corrections:

1. Consistency in Javadoc tags: Ensure consistent use of @param, @return, @author, etc.
2. Clarity and conciseness: Reword some descriptions for better understanding.
3. Grammar and spelling: Correct any grammatical errors or typos.
4. Add {@code ...} for code elements: For class names, method names, or variable names mentioned in Javadoc.