http_streamer: switch to libnetservices.a

Switch to the experimental services API as the copy in libbnetapi.so is
deprecated.

Change-Id: I57d76b1d1be5c957221cc2d77d148fadbac2a642
Reviewed-on: https://review.haiku-os.org/c/haiku/+/3668
Reviewed-by: Adrien Destugues <pulkomandy@gmail.com>

libnetservices.a: Put the experimental API into BPrivate::Network namespace

In order to prevent classes between libnetapi.so with the legacy API and
applications using the libnetservices.a library, the latter will have the
classes in a distinct namespace.

In the implementation, both libbnetapi.so and libnetservices.a will use the
same header and source files. If LIBNETAPI_DEPRECATED is defined during build,
the headers and source will have binary compatible behavior. Otherwise, the
classes and other objects will be put in the HaikuExt namespace.

In order to build the libbnetapi.so and libnetservices.a with the proper
build configuration, there is a stub `src/kits/net/libnetapi_deprecated` folder
that applies the special configuration to the source files.

Currently HaikuDepot, Webpositive, libshared.a and the http_streamer add on
use the compatible API in libbnetapi.so.

Change-Id: Ic73e9f271ef75749adda46f6f72e9a0b2851b461
Reviewed-on: https://review.haiku-os.org/c/haiku/+/3667
Reviewed-by: Adrien Destugues <pulkomandy@gmail.com>

libnetapi.so: make headers of deprecated classes private

These classes have been moved to the public API too soon, and they need some
more time to mature before they can be declared stable.

Change-Id: I9c52a8e6cc103922abde7a6b911fe0c3e6bf5700
Reviewed-on: https://review.haiku-os.org/c/haiku/+/3665
Reviewed-by: Adrien Destugues <pulkomandy@gmail.com>

Revert the Codec Kit.

All of Barrett's individual reverts have been squashed into this
one commit, save a few actual bugfixes.

Change-Id: Ib0a7d0a841d3ac40b1fca7372c58b7f9229bd1f0

http_streamer: Remove shared headers dependency

Welcome Codec Kit!

* Fix MediaDebug header.
* Add codec lib name mapping.

MediaPlugins: Make some plugins to use experimental headers.

http_streamer: General refactor making use of new API

* Use BUrlProtocolRoster instead of BFileRequest.
* Removed HTTPMediaIO custom code that now inherits
BAdapterIO and make the whole thing more simple.
* It work with some formats (flv, mp3, mkv) but ffmpeg fail
on others (mp4, 3gp).
* GetSize needs improvements.

http_streamer: Add basic draft version