Initial Commit of full native bitmap macOS implementation

Right now, to better test regressions, with dual implementation

include/wx/osx/setup0.h

@@ -1622,6 +1622,13 @@
 // make sure we have the proper dispatcher for the console event loop
 #define wxUSE_SELECT_DISPATCHER 1
 #define wxUSE_EPOLL_DISPATCHER 0
+
+// set to 1 if you have older code that still needs icon refs
+#define wxOSX_USE_ICONREF 0
+
+// set to 0 if you have code that has problems with the new bitmap implementation
+#define wxOSX_BITMAP_NATIVE_ACCESS 1
+
 /* --- end OSX options --- */
 
 #endif