Replace the 'Refresh' button with a Timer

[ThijsRay]

Closes PM-557

Description

Whenever you would start the simulation, the input device would not accurately display the available gaits. This could be fixed by pressing the "Refresh" button. This behaviour can be changed in multiple ways, such as:

• adding a topic to the gait state machine, that publishes when it is ready and when a change has been made to the state machine
• retrieving an up-to-date list op possible gaits every x milliseconds

I have chosen the second option, since it ensures that the input device will always reflect the current state of the state machine. Besides that, the gait state machine is being refactored right now in project-march/march#583 and changing behaviour in the state machine would probably result in unnecessary merge conflicts.

Changes

This pull request replaces the manual "Refresh" button with an automatic timer, so you don't have to press the "Refresh" button on startup or when an incorrect state is displayed on the input device.

Testing

[codecov]

Codecov Report

Merging #71 into develop will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff            @@
##           develop      #71   +/-   ##
========================================
  Coverage    68.36%   68.36%           
========================================
  Files            9        9           
  Lines          411      411           
  Branches        50       50           
========================================
  Hits           281      281           
  Misses         123      123           
  Partials         7        7           

Flag	Coverage Δ
#production	46.32% <ø> (ø)
#test	96.66% <ø> (ø)

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