Resolution switching without reconnecting.

- Based on https://github.com/jsorg71/xrdp/tree/dynamic_monitor
- Tested with xorgxrdp
- Tested with vnc
- Only works with single monitor.
- Update documentation to clarify the difference between MSTSC and
Microsoft Remote Desktop.
- Does not include compatibility with /gfx at this time, which is still
in testing.
- Updates to include ms-rdpedisp.h header for the 2.2.2 specification of
the protocol.
- Adds new dynamic_monitor_layout struct that shares the number of
monitors with xrdp_client_info.h
- Does not allow for BPP changes because the RDP protocol doesn't
support it.
- Option to disable feature as NeutrinoRDP doesn't support it (It was
based on FreeRDP 1.0.1 which didn't yet have this feature.)
- Add CLIENT_MONITOR_DATA_MAXIMUM_MONITORS constant and reference
spec definition.

Depends on https://github.com/neutrinolabs/xorgxrdp/pull/183

README.md

@@ -9,9 +9,15 @@
 ## Overview
 
 **xrdp** provides a graphical login to remote machines using Microsoft
-Remote Desktop Protocol (RDP). xrdp accepts connections from a variety of
-RDP clients: FreeRDP, rdesktop, KRDC, NeutrinoRDP and Microsoft Remote Desktop
-Client (for Windows, Mac OS, iOS and Android).
+Remote Desktop Protocol (RDP). xrdp accepts connections from a variety of RDP clients:
+  - FreeRDP
+  - rdesktop
+  - KRDC
+  - NeutrinoRDP
+  - Windows MSTSC (Microsoft Terminal Services Client)
+  - Microsoft Remote Desktop (which is distinct from MSTSC)
+
+Many of these work on some or all of Windows, Mac OS, iOS, and/or Android.
 
 RDP transport is encrypted using TLS by default.
 
@@ -24,7 +30,7 @@ RDP transport is encrypted using TLS by default.
  * Connect to a Linux desktop using RDP from anywhere (requires
    [xorgxrdp](https://github.com/neutrinolabs/xorgxrdp) Xorg module)
  * Reconnect to an existing session
- * Session resizing
+ * Session resizing on connect and while an existing session is active.
  * RDP/VNC proxy (connect to another RDP/VNC server via xrdp)
 
 ### Access to Remote Resources