- Mostly base functions and utilities necessary to enable RFX
  Progressive
- Add more EGFX work & mode flags.
- Update encoder.
- Does not yet include caps determination to enable RFX progressive
  (yet).
- Update protocol constants

- Introduce functional EGFX caps.
- Prototype of RFX Progressive working.
- Update resizing to work with it.
- Refactoring

…to -1.

#2911)

* GFX: sort versions, flags to return the highest version we support in caps advertise

* GFX: simpify swtich in caps_advertise

* GFX: log skipped capability versions in caps_advertise

 - Also update librfxcodec

Without some checking for this call, it's possible for the xrdp
process to never end when the client goes away.

mstsc.exe indicates it supports GFX in the early capability flags, even
if it not able to support 32 BPP. This results in a session failure
if a RDPGFX_CAPS_CONFIRM_PDU is sent on the EGFX virtual channel.

Since v0.9.9, xrdp has assumed that the "drdynvc" static virtual
channel is available for its exclusive use. With GFX support, it
is necessary to codify this to prevent this sequence of operations:-

- NeutrinoRDP target sends DVC Capabilities Request PDU
- target responds wih DVC Capabilities Response PDU
- xrdp processes this, starting the GFX virtual channel again

In the future, if NeutrinoRDP requires access to virtual channels,
data may somehow need to be passed through to the target while being
parsed and handled appropriately within xrdp.

* Store EGFX state before entering resize state machine

At present the EGFX state is destroyed by states WMRZ_EGFX_DELETE_SURFACE
through WRMZ_EGFX_DELETE. This means that at WMRZ_EGFX_INITIALIZE we
cannot distinguish between EGFX not being ever used, and EGFX
having been torn down. Consequently, when running non-GFX, we don't
correctly recover the session.

* Allow multiple reasons for suppress_output

Replaces the single boolean for suppress_output with
a bitmask, to allow output to be suppressed for
more than one reason

* Disable output during resize

* Add states to dynamic resize

Adds states to the dynamic resize state machine so we wait for a
Deactivation-Reactivation sequence to finish before sending pointer
updates, etc.

* suppress module output during the dynamic resize

* Add support for dynamic resize to VNC backend

xrdp_mm needs to be informed when a resize has been performed so that
the resize stte machine can be updsate.

* GFX: work on multimon

* fix for non GFX multimon