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

tests/archive/ziptest.cpp

@@ -180,7 +180,7 @@ void ZipPipeTestCase::runTest()
 
     {
         PFileInputStream in(cmd);
-        if (in.Ok())
+        if (in.IsOk())
             out.Write(in);
     }