Update wxWidgets
Update wxWidgets

In particular, this pulls in support for the VS2015 compiler.

artillery/winsparkle,dsuess/winsparkle,Herve-M/winsparkle,Herve-M/winsparkle,nickdademo/winsparkle,dsuess/winsparkle,artillery/winsparkle,drizt/winsparkle,nickdademo/winsparkle,drizt/winsparkle