Add Right & Left Eye Open Ratio for Wink

[botamochi6277]

Description

Update features for wink motions

• Add rightEyeOpenRatio & leftEyeOpenRatio to Avatar and DrawContext, respectively.
• Remove eyeOpenRatio from Avatar and DrawContext
• Add rightGaze & leftGaze to Avatar
• Remove conventional Gaze from Avatar
• Add isAutoBlink property to Avatar to stop/resume automatic blinking
• Add wink-demo.ino that is demo for manual winking(A/C button) and stopping/resuming blinking(B button)

Type of change

• [x] Feature Enhancement