MediaPipe Pose v0.6.1 alpha

Some more additions and fixes since the last version:

• Added option to flip rotation calibration
• Added two profiles for smoothing values
• Autocalibration checkboxes now save
• Moved neck offset to inference gui
• Added some mediapipe parameters, including model complexity
• Fixed issue where feet were flipping direction if smoothing window was disabled

Known issues:

• Rotation calibration may not save correctly in some cases

The MediaPipe parameters are described here: https://google.github.io/mediapipe/solutions/pose.html