Remove an outdated hack from Renderer.
Reference mono's libfreetype under osx.
Move winforms crash dialog into an external helper.
Add a native crash dialog for OSX.
Remove Windows.Forms dependencies from game and utility. Fixes #4348.
Merge pull request #5244 from pchote/bye-bye-winforms

Remove X11 dependency from OSX.
Closes #3872
Closes #4348