Minor UI improvements.

- The Feedback screen subject and message fields must be non-blank after trimming whitespace. - Added text “Swipe left to delete” above the card lists on the home screen. This capability was already there but now it is made obvious on the home screen without having to read the help. - Added text “Longpress drag to re-order” above the card lists on the home screen. This capability was already there but now it is made obvious on the home screen without having to read the help.

- Added a confirmation “Are you sure?” dialog box when leaving the circuit editor with unsaved changes. - Added a one-line gate description for each gate type on the Lab screen.

- Wire connection lines between gates on a circuit card now change color to reflect their state true (green) or false (red) or undetermined (gray). - The Lab screen has been re-done to include the gate symbol for the selected gate in order to be more intuitive for those learning logic gates.

- Added the ability to remove an unused INPUTS node or OUTPUTS node from a Circuit Card. - Always use red background for icon false instead of gray on a Logic Card. - Improved help text. - Bug fixes. - UI improvements.

Added the ability to vertically scroll the circuit within the circuit design screen.

2.0 introduces logic gate chaining. Output from one gate can be dragged/chained to the input of another gate thereby building simple logic circuits. The truth table can be displayed for any circuit and compared to expected result.