Warning fixes to unused variables, int/wxChar keycode and other typecasting, not mixing 'type*' and 'type' variables in single line, IsEmpty to empty replacement etc.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@30305 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/common/menucmn.cpp

@@ -141,7 +141,7 @@ wxAcceleratorEntry *wxGetAccelFromString(const wxString& label)
             }
         }
 
-        if ( current.IsEmpty() ) {
+        if ( current.empty() ) {
             wxLogDebug(wxT("No accel key found, accel string ignored."));
         }
         else {
@@ -262,7 +262,7 @@ void wxMenuItemBase::SetAccel(wxAcceleratorEntry *accel)
             // we should process them here
 
             default:
-                if ( wxIsalnum(code) )
+                if ( wxIsalnum((wxChar)code) )
                 {
                     text << (wxChar)code;