Mostly don't mention OS/2 in the comments about the icons. Also replace a couple of occurrences of "wxWindows" with "wxWidgets". Closes https://github.com/wxWidgets/wxWidgets/pull/138
Mostly don't mention OS/2 in the comments about the icons. Also replace a couple of occurrences of "wxWindows" with "wxWidgets". Closes https://github.com/wxWidgets/wxWidgets/pull/138