MIGraphX, new model, new option!

• Add MIGraphX execution provider (#740)
• Add MediaPipe multi-class selfie segmentation model (#742)
• Add option to keep the filter enabled when scene becomes inactive (#747)
• Fix wolfSSL not to crash (#735)
• Fix AVX2 not to be required for better compatibility (#754)
• Add link to the Lite version (#753)

Thank you for your all the feedback!