Merge branch 'web-request'

Add wxWebViewRequest and related classes allowing to use HTTPS and
HTTP/2.

See https://github.com/wxWidgets/wxWidgets/pull/977

tests/test.cpp

@@ -171,7 +171,13 @@ static void TestAssertHandler(const wxString& file,
 
 CATCH_TRANSLATE_EXCEPTION(TestAssertFailure& e)
 {
-    return e.m_msg.ToStdString(wxConvUTF8);
+    wxString desc = e.m_msg;
+    if ( desc.empty() )
+        desc.Printf(wxASCII_STR("Condition \"%s\" failed"), e.m_cond);
+
+    desc += wxString::Format(wxASCII_STR(" in %s() at %s:%d"), e.m_func, e.m_file, e.m_line);
+
+    return desc.ToStdString(wxConvUTF8);
 }
 
 #endif // wxDEBUG_LEVEL