kawaii-player-v6.0.0-1

• Update buiild/install process for kawaii-palyer to make it compatible with mpv opengl-render API. Please check updated installation instructions.
• completely remove support for mpv opengl-cb API
• Consolidate support for libvlc as an alternate backend and make it reliable for playback
• add support for yt-dlp and deprecate youtube-dl
• changes in web-ui
  • added button for casting url
  • allow changing playback engine from web-interface
• make installation easier and performance robust of kawaii-player on raspberry-pi (4B+) devices
  • script for installation of kawaii-player on raspberry-pi
• minor bug-fixes - please check the commit history