logger: add console logging code for Windows

Previously, AllocConsole was called from the client. This has been
moved into the ConsoleLog class. When calling Logger::setConsoleLog
an attempt to attach to the console of the parent process will be
made first. This will be the case when Jami is being run from a
command line with the debug option. Otherwise, the logger will use
AllocConsole to instantiate a console window for the logs. The
latter will have it's lifetime bound by Jami.

Change-Id: I7f1728626962a2f702ad564bb16deadc2d92dfb7