Fix lots of warnings reported by Clang.

Mostly potentially lossy implicit conversions in headers (long->int). Also dangling else warnings. Struct/class mismatches.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@74473 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/windowid.h

@@ -43,7 +43,7 @@ public:
 
     wxWindowIDRef(long id)
     {
-        Init(id);
+        Init(wxWindowID(id));
     }
 
     wxWindowIDRef(const wxWindowIDRef& id)
@@ -66,7 +66,7 @@ public:
 
     wxWindowIDRef& operator=(long id)
     {
-        Assign(id);
+        Assign(wxWindowID(id));
         return *this;
     }