Added check for mac when assigning button to remove files from list in GUI. Posix treats right click as mouse 2 not mouse 2 as in windows
Added check for mac when assigning button to remove files from list in GUI. Posix treats right click as mouse 2 not mouse 2 as in windows

lilfolr/CITS4406-Assignment2,lilfolr/CITS4406-Assignment2,lilfolr/CITS4406-Assignment2