This commit will add a logging system to solve the problem that
one actually need to recompile rdesktop from source to enable
different debug logging.
- Same logging api for all kind of logging and messages to
end user.
- Adding -v for verbose output when running rdesktop.
- All messages are logged into a subject and with a type, eg:
logger(Keyboard, Notice, "Autos-electing %s based on locale.", locale);
- Debug logging is enabled trough a environment variable RDEKSTOP_DEBUG,
which specifies subjects of interest, comma separated. There is a special
subject named All which includes all subject for debug loggin. There is also
a simple logic opeartor '!' = NOT which can be used in combination like:
RDESKTOP_DEBUG=All,!Graphics,!Sound
Which would give debug log output for All subject except Graphics and Sound.
