Bug 545769 - [console] UTF-8 content read or send to process can be
corrupted

With some bad luck the ProcessConsole may disrupt multibyte UTF-8
characters read from input source (usually user input or file) due to
incorrect stream reading / buffer handling.
The same problem exist for reading the processes output streams.

Change-Id: I8d52d1973f3739e2c510a8a4c48b44f345c33dfe
Signed-off-by: Paul Pazderski <paul-eclipse@ppazderski.de>