Add WXK_XXX constants for the standard multimedia keys and generate events corresponding to them under wxGTK and wxMSW. Closes https://github.com/wxWidgets/wxWidgets/pull/157
Add WXK_XXX constants for the standard multimedia keys and generate events corresponding to them under wxGTK and wxMSW. Closes https://github.com/wxWidgets/wxWidgets/pull/157