DueUI Release v3.0.2 Available

[gtj0]

https://github.com/gtjoseph/DueUI/releases/tag/v3.0.2

Added UI Test Mode

• There's a new settings option "Test Mode" which, when turned on,
  will bypass attempts to connect to a Duet or SBC. This will
  allow you to design the GUI without having access to an actual
  Duet device. You must still provide a valid URL to the DueUI
  config file.

Heater widget updates

• Heater state values were updated for RRF 3.01

• Fixed incorrect heater tolerance calculations