New Features

• Added m1k1o/neko:vivaldi tag (thanks @Xeddius).
• Added m1k1o/neko:opera tag (thanks @prophetofxenu).
• Added NEKO_PATH_PREFIX.
• Added screenshot function /screenshot.jpg?pwd=<admin>, works only for unlocked rooms.
• Added emoji support (by @yesBad).
• Added file transfer (by @prophetofxenu).

Misc

• Server: Split remote to desktop and capture.
• Server: Refactored xorg - added xevent and clipboard is handled as event (no looped polling anymore).
• Introduced NEKO_AUDIO_CODEC= and NEKO_VIDEO_CODEC= as a new way of setting codecs.
• Added CORS.
• Opera versions are not hardcoded in Dockerfile anymore but automatically are fetch latest.