Adding error message for single field set attempt.

Client now enforcing field creations to guarantee client side fields always
in sync.

Adding indicators layout demo.

Prevent stackoverflow when client reconnects.
Client now specifies layout rather than relying on default one.

Merge field unification changes and client recovery feature.

Onlu update client tree view when needed.

Removing specific functions for setting text and bitmap.
Now having a generic functions for setting any kind of fields.
Thus bitmaps can now be set together with text fields in a single server call.

Removing some Text and Bitmap specific stuff and using generic Field instead.

Client now recovers from faulty states and timeout.

Now having a single class for both text and bitmap field.
Thus we should soon be able to use common functions to pass in fields.