Improve handling of prettified responses without correct content-type encoding (#1110)

* Improve handling of responses without correct content-type charset

* [skip ci] Minor tweaks in tests

* [skip ci] Add documentation

Co-authored-by: claudiatd <claudiatd@gmail.com>

* Improve unknown encoding test

[skip ci]

* Review mime and options retrieval

* Add full content-type example in help output

* Simplify decoder

* [skip ci] s/charset/encoding/

* Tweaks

* [skip ci] Fix type annotation

* [skip ci] s/charset/encoding/

* Tweaks

* Fix type annoation

* Improvement

* Introduce `codec.encode()`

* [skip ci] Tweak changelog

Co-authored-by: claudiatd <claudiatd@gmail.com>

docs/README.md

@@ -1249,6 +1249,18 @@ For example, the following request will force the response to be treated as XML:
 ```
 
 You will nearly instantly see something like this:
+
+```http
+HTTP/1.1 200 OK
+Content-Type: application/octet-stream
+
+```
+
+### Redirected output
+
+HTTPie uses a different set of defaults for redirected output than for [terminal output](#terminal-output).
+The differences being:
+
 - Formatting and colors aren’t applied (unless `--pretty` is specified).
 - Only the response body is printed (unless one of the [output options](#output-options) is set).
 - Also, binary data isn’t suppressed.