Extract Autobahn test suite to a separate CI step (#199)

Add Dialer.Host field (#196)

Remove common wsutil.Reader allocations (#189)

![image](https://github.com/gobwas/ws/assets/5663952/b7f5a544-f6f0-44cf-b38c-e89fd3de0bd4)

* `ws.ReadHeader` allocates a 12 byte temporary buffer to read the header into. Since `io.ReadFull` is used, it escapes to the heap.

* `wsutil.NewCipherReader` is used for many calls.

Since the `NextFrame` shouldn't have concurrent calls, both of these should be possible to have internally.

I am forced to copy "readHeader" from `ws`, since there is not way to eliminate the alloc otherwise as far as I can tell.

Hijack connection through `http.ResponseController` in http upgrader (#…

…181)

ws: bring back support for go1.16

Running `go1.16 build .` failed with:

    //go:build comment without // +build comment

dialer: move negotiated extension and copy extension parameters

Fixes following issue:
Extensions in Handshake returned from (Dialer) Upgrade contain slices
pointing to memory in buffer already returned to pbufio.ReaderPool.

readme: improve compression example

wsflate: avoid double buffering when using flate.Reader (#137)

This commit makes wsflate.suffixedReader to optionally implement
io.ByteReader. That is, if source object is buffered (bytes.Reader,
bufio.Reader etc.) and implements io.ByteReader, but suffixedReader not,
then flate.NewReader() will allocate new bufio.Reader for it. This
commit fixes it and adds runtime checks on suffixedReader source to hide
ReadByte() method if source is a pure io.Reader.

Fixes #130

spell fix

wsflate: IsCompressed() shortcut