Initial commit for the SWT-OS2 project

This is where the baseline for SWT-OS2 starts.
Because is was not clear for some time which branch would be suitable
to start with, this has been investigated first. Also, most changes involved
the Odin32 component, which is not part of this repository. The upcoming
commits provide a 'sanitized' path to the current state which is a successful
build of the swt.dll for OS/2.
Added README.OS2