* Fix `Uri::__toString` for network path references, e.g. `//example.org`. * Fix missing lowercase normalization for host. * Fix handling of URI components in case they are `'0'` in a lot of places, e.g. as a user info password. * Fix `Uri::withAddedHeader` to correctly merge headers with different case. * Fix trimming of header values in `Uri::withAddedHeader`. Header values may be surrounded by whitespace which should be ignored according to RFC 7230 Section 3.2.4. This does not apply to header names. * Fix `Uri::withAddedHeader` with an array of header values. * Fix `Uri::resolve` when base path has no slash and handling of fragment. * Fix handling of encoding in `Uri::with(out)QueryValue` so one can pass the key/value both in encoded as well as decoded form to those methods. This is consistent with withPath, withQuery etc. * Fix `ServerRequest::withoutAttribute` when attribute value is null.