added static wxPlatformInfo::Get() and use it (patch 1549176)

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@41807 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

docs/latex/wx/apptraits.tex

@@ -83,6 +83,8 @@ It's normally the same for wxBase and wxGUI except in the case of wxMac and wxCo
 Returns the wxWidgets port ID used by the running program and eventually
 fills the given pointers with the values of the major and minor digits
 of the native toolkit currently used.
+The version numbers returned are thus detected at run-time and not compile-time
+(except when this is not possible e.g. wxMotif).
 
 E.g. if your program is using wxGTK port this function will return wxPORT\_GTK and
 put in given pointers the versions of the GTK library in use.