Preliminary changes for wxWidgets 3.0.1

We can't go to 3.0.1 yet as there are still build issues on
Linux and OSX.  You can get Windows to build, but there's
still some display issues.

These changes should work with wxWidgets 2.8.12 as well, so
we can take our time to get things working properly before
switching over.

src/effects/BassTreble.cpp

@@ -35,6 +35,7 @@
 #include <wx/checkbox.h>
 #include <wx/slider.h>
 #include <wx/sizer.h>
+#include <wx/textctrl.h>
 
 // Used to communicate the type of the filter.
 static const int bassType = 0; //Low Shelf

src/effects/Compressor.h

@@ -14,6 +14,8 @@
 class wxString;
 
 #include <wx/defs.h>
+#include <wx/dc.h>
+#include <wx/dcclient.h>
 #include <wx/bitmap.h>
 #include <wx/button.h>
 #include <wx/checkbox.h>

src/effects/Contrast.cpp

@@ -496,7 +496,7 @@ void ContrastDialog::OnExport(wxCommandEvent & WXUNUSED(event))
    wxString fName = wxT("contrast.txt");
 
    fName = FileSelector(_("Export Contrast Result As:"),
-                        NULL, fName, wxT("txt"), wxT("*.txt"), wxFD_SAVE | wxRESIZE_BORDER, this);
+                        wxEmptyString, fName, wxT("txt"), wxT("*.txt"), wxFD_SAVE | wxRESIZE_BORDER, this);
 
    if (fName == wxT(""))
       return;

src/effects/VST/VSTEffect.cpp

@@ -3579,7 +3579,7 @@ void VSTEffect::SizeWindow(int w, int h)
       wxCommandEvent sw(EVT_SIZEWINDOW);
       sw.SetInt(w);
       sw.SetExtraLong(h);
-      mDlg->AddPendingEvent(sw);
+      mDlg->GetEventHandler()->AddPendingEvent(sw);
    }
 
    return;
@@ -3590,7 +3590,7 @@ void VSTEffect::UpdateDisplay()
    // Tell the dialog to refresh effect information
    if (mDlg) {
       wxCommandEvent ud(EVT_UPDATEDISPLAY);
-      mDlg->AddPendingEvent(ud);
+      mDlg->GetEventHandler()->AddPendingEvent(ud);
    }
 }
 

src/effects/nyquist/Nyquist.cpp

@@ -716,7 +716,7 @@ bool EffectNyquist::Process()
          // See also http://bugzilla.audacityteam.org/show_bug.cgi?id=642#c9
          // for further info about this thread safety question.
          wxString prevlocale = wxSetlocale(LC_NUMERIC, NULL);
-         wxSetlocale(LC_NUMERIC, wxT("C"));
+         wxSetlocale(LC_NUMERIC, wxString(wxT("C")));
 
          nyx_init();
          nyx_set_os_callback(StaticOSCallback, (void *)this);