[CMD][CONUTILS] Move the generic console-input code into CONUTILS.

CORE-13860

- All the code that deals with reading in an asynchronous way console
  input data is now moved to conutils/instream.c, and proper interfaces
  are written around it. This allows possible reusage in other
  command-line programs.
- The code in cmd/console.c just wraps around these conutils interfaces.
- Remove old dead code in conutils/instream.c.
- Move code that retrieves console information into conutils/screen.c,
  function ConGetScreenInfo() which now works for both Win32 consoles and
  TTYs, and adjust the calls to this function.

sdk/lib/conutils/CMakeLists.txt

@@ -1,6 +1,6 @@
 
 list(APPEND SOURCE
-    # instream.c
+    instream.c
     outstream.c
     pager.c
     screen.c
@@ -13,4 +13,4 @@ add_library(conutils ${SOURCE})
 # add_pch(conutils conutils.h SOURCE)
 add_dependencies(conutils xdk)
 target_link_libraries(conutils ${PSEH_LIB})
-add_importlibs(conutils msvcrt kernel32)
+add_importlibs(conutils msvcrt kernel32 user32)

sdk/lib/conutils/conutils.h

@@ -34,7 +34,7 @@
 
 #include "utils.h"
 #include "stream.h"
-// #include "instream.h"
+#include "instream.h"
 #include "outstream.h"
 #include "screen.h"
 #include "pager.h"