Add wxTE_{RIGHT,CENTER} support for multiline wxTextCtrl in wxOSX

Just use -[NSTextView setAlignment].

Closes #13702.

(cherry picked from commit d45ba8ce62)

docs/changes.txt

@@ -662,6 +662,7 @@ wxOSX:
 - Fix custom paper support (tijsv).
 - Return false from wxSound::Create()/IsOk() if the file doesn't exist.
 - Fix scrolling behaviour of wxSearchCtrl (John Roberts).
+- Add wxTE_{RIGHT,CENTER} support for multiline wxTextCtrl (Andreas Falkenhahn).
 
 
 3.0.2: (released 2014-10-06)

include/wx/osx/cocoa/private/textimpl.h

@@ -62,7 +62,7 @@ private:
 class wxNSTextViewControl : public wxWidgetCocoaImpl, public wxTextWidgetImpl
 {
 public:
-    wxNSTextViewControl( wxTextCtrl *wxPeer, WXWidget w );
+    wxNSTextViewControl( wxTextCtrl *wxPeer, WXWidget w, long style );
     virtual ~wxNSTextViewControl();
 
     virtual wxString GetStringValue() const ;

src/osx/cocoa/textctrl.mm

@@ -561,7 +561,7 @@ NSView* wxMacEditHelper::ms_viewCurrentlyEdited = nil;
 
 // wxNSTextViewControl
 
-wxNSTextViewControl::wxNSTextViewControl( wxTextCtrl *wxPeer, WXWidget w )
+wxNSTextViewControl::wxNSTextViewControl( wxTextCtrl *wxPeer, WXWidget w, long style )
     : wxWidgetCocoaImpl(wxPeer, w),
       wxTextWidgetImpl(wxPeer)
 {
@@ -581,6 +581,15 @@ wxNSTextViewControl::wxNSTextViewControl( wxTextCtrl *wxPeer, WXWidget w )
     [tv setHorizontallyResizable:NO];
     [tv setAutoresizingMask:NSViewWidthSizable];
 
+    if ( style & wxTE_RIGHT)
+    {
+        [tv setAlignment:NSRightTextAlignment];
+    }
+    else if ( style & wxTE_CENTRE)
+    {
+        [tv setAlignment:NSCenterTextAlignment];
+    }
+
     if ( !wxPeer->HasFlag(wxTE_RICH | wxTE_RICH2) )
     {
         [tv setRichText:NO];
@@ -1055,7 +1064,7 @@ wxWidgetImplType* wxWidgetImpl::CreateTextControl( wxTextCtrl* wxpeer,
     {
         wxNSTextScrollView* v = nil;
         v = [[wxNSTextScrollView alloc] initWithFrame:r];
-        c = new wxNSTextViewControl( wxpeer, v );
+        c = new wxNSTextViewControl( wxpeer, v, style );
         c->SetNeedsFocusRect( true );
     }
     else