Move console handlers to console.c

Move console handlers to console.c

Isolate console handler code from fdo code.
This will make the console code easier to maintain.

Signed-off-by: Owen Smith <owen.smith@citrix.com>
Rename __ConsoleDestroy() to __ConsoleDestroyHandle() and introduce
__ConsoleCreateHandle() which is called by ConsoleOpen() to allocate and
initialize a handle.

Signed-off-by: Paul Durrant <paul.durrant@citrix.com>