Make GIF generator using existing test cases

[pokey]

Could use existing recorded test cases to automatically record GIFs to add to the docs. Could do this either by having talon send the full command text and save it with the test case, or build something to generate talon command from json

• For the GIF generation, we could easily automatically find all test cases that use a particular action to put into the doc for that action. Same with transformations, etc
• Ideas for making a good GIF:
  • making text larger,
  • making command text show a good delay before action,
  • having one command per GIF so you can see the same one over and over,
  • slowing down highlight
  • put something in the gif where you can clearly see when the loop point is (thanks @timo!). Can possibly use https://github.com/nwtgck/gif-progress
  • have 1 sec delay at start of gif (thanks @timo)
  • use longer decorationSleepTimeout than usual
  • somehow call out the decoration that is referenced in the command, possibly by making it bigger? Could either do this from the start of GIF, or right after they say the command before it executes