Add WebSocket Subprotocol support per @terjeio suggestion
Change ESP800 report to use FlashFileSystem instead of FileSystem per @terjeio suggestion for consistency
Add Host Path support for files hosted in subdirectory (WIP)
Add createPath flag for upload to create full path if does not exists
Update embedded page to support new ESP800 flags
Update WebSocket library to avoid warning
Update Features.md
Bump platformIO to 5.1.0
Bumb version to 204
