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Do not declare *_sys_t typedefs globally in vlc_common.h. Instead,
declare them locally in each module that provides a definition.

This paves the way to move C++ definitions into anonymous namespaces in
order to respect C++ ODR.

The picture_resource_t and sout_stream_id_sys_t typedefs will be handled
separately, since they require specific additional changes.

See #18033
Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>

This was not implemented properly and of questionable usefulness.

Due to recent keystore functional changes.
see 5a4393b8 and 67373b6

They have been identical for a while.

pf_read() returns 0 to signify EOF, and -1 to signify no data.
pf_block() returns NULL either way. This flag is added for the
distinction.

If present - this is currently only supported by the playlist.

Header field folding is not implemented.

As of now, the new module works if:
 - proxy is not used,
 - cookies are disabled,
 - HTTP "continuous" streaming mode is not enabled,
 - authentication is not required.

In practice, it remains disabled by default because HTTP cookies are
enabled. --no-http-forward-cookies is needed.

This adds a new plugin for HTTPS supporting HTTP version 2.0
(IETF RFC 7540), and based on the latest version of HTTP protocol
semantics (IETF RFC7230-9 series).

It provides support for seeking in a single round trip time by
reusing the same TCP connection and TLS session. It could be further
extended to reusing connections over multiple access instances,
e.g. to support segmented streaming.

It also addresses a number of protocol bugs in the existing HTTP
stack, such as handling of HTTP 100, 201 and 416 codes. It also adds
automatic safe reconnection.

Currently, the old HTTP access is favored due to a few missing
features:
- HTTP 1.1 fallback - work in progress,
- proxies (i.e. HTTP CONNECT) - work in progress,
- authentication,
- cookies.

This more closely matches the usual open/read/seek/close pattern.