Form Tabs; updated interface

The Form Tabstrip has been updated as follows:

1. Cleaner and simpler drawing style to match more modern interfaces.

2. Window dropdown on left hand side removed.

3. Edit/ Add supplemental icon removed.

4. Larger tab widths supported.

5. When all tabs do not fit within the tabstrip, each tab becomes narrower.

In addtion the new colour themes and touch mode interfaces are supported.