Feat: WAVLoader: Ensures clean instance state, optimization + javadoc - #2496

Key improvements include:

• Comprehensive Javadoc: Detailed documentation has been added to all classes, methods, and significant fields, making the code much easier to understand and use.
• Enhanced Readability: Variables have been consistently renamed for better clarity and adherence to Java naming conventions .
• Increased Robustness & Clean State:
  • The WAVLoader's instance variables are now explicitly nullified or reset after each load operation, ensuring a clean state for subsequent uses and proper resource management. (see ResettableInputStream, AudioData, AudioBuffer, AudioStream)
• Minor Optimizations: Buffer reading has been optimized, and logging messages are now more efficient.

These changes collectively make the WAVLoader more reliable and simpler to integrate and maintain within the jMonkeyEngine asset pipeline.