Mac: Implemented the required delegate selectors so NSView is now active. Basic functionality is working now, but the NSTableCellView is not being displayed. Commiting and going to try to debug the display issue on 10.11 using the interface inspector which no longer works on later versions of MacOS. This commit and potentially the next few will cause partial breakages on MacOS Yosemite (10.10) and later.

[Desktop Entry]
Name=Dynamic Windows Test
Exec=@prefix@/bin/dwtest 
Terminal=false
MultipleArgs=false
Type=Application
Categories=Application;Development;X-Red-Hat-Base;