Update README.md with major enhancement clause
Update README.md
Update README.md

Added the jkhub link to links of interest.
Removed the engine hack comment about the net address types as it isn't really relevant.  And some others might change in the future with ipv6.
Merge remote-tracking branch 'upstream/master'
Fixed FindSDL2 CMake module to find the SDL2 library properly on OS X.
Fixed Enter key not being recognized properly with SDL.
Fixed backspace not being processed correctly by SDL translation layer