WebSocket: Add comment and explicit base type for FrameOpCode
WebSocket: Add comment and explicit base type for FrameOpCode

Geod24/vibe.d,DBankov/vibe.d,etcimon/vibe.d,etcimon/vibe.d,AndreyMZ/vibe.d,rejectedsoftware/vibe.d,gedaiu/vibe.d,chalucha/vibe.d