[CMD]: Use the CONUTILS library (Part 1/x) for an uniform and consistent experience...

[CMD]: Use the CONUTILS library (Part 1/x) for an uniform and consistent experience across command-line tools.
- Make most of CMD use the conutils library. This means that
  now we explicitely use the CON_STREAM objects. In particular code
  handling STDIN/OUT/ERR redirection should be handled with care.
- Factor out much of console-related support code into console.c.
  Code for console input is however not "CON_STREAM-enabled" yet.
- Change ConOutPrintfPaging prototype to make it return TRUE/FALSE
  when it can continue paged-printing or not, respectively.
CORE-13860

svn path=/trunk/; revision=76023