Replaced Ok() occurrences with IsOk() throughout trunk.

Additionally renamed wxOSX' private wxNativePrinterDC::Ok() function to IsOk().

Didn't deprecate the various Ok() functions: given the amount of changes already introduced in 3.0 a trivial one like this seems more suitable for after 3.0.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@67681 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/common/tbarbase.cpp

@@ -757,7 +757,7 @@ bool wxCreateGreyedImage(const wxImage& in, wxImage& out)
 {
 #if wxUSE_IMAGE
     out = in.ConvertToGreyscale();
-    if ( out.Ok() )
+    if ( out.IsOk() )
         return true;
 #endif // wxUSE_IMAGE
     return false;