Remote GFXSettings and Clipboard section as it was no longer used. This
is a non breaking change, existing entries will be ignored (just like up
until now) but the generated config now no longer contains it.
To support legacy targets add the TlsSecLevel configuration option that
is equivalent to the /tls:seclevel option of the client implementations.
This allows automatic configuration of OpenSSL legacy providers if they
are available.
This adds a User, Domain and Password parameter in the Target section of the configuration
to specify and use a fixed backend user, domain or password (overriding the one
passed by the front user).
* Split out proxy headers and moved to public API to allow external
modules to be built.
* Split proxy into proxy library and proxy binary. The library
can be used by other applications and provides a simple API
* Improved channel passthrough, now all channels including dynamic
channels work.
* Extended module API to hook more events, improved module samples
* Cleaned up proxy code, removed global static variables used,
added WINPR_ASSERT
