IMPROVE design of addon-events

[ndelangen]

Issue: -addon-events-looked-pretty -rough-

What I did

I improved it by a margin

How to test

view cra-storybook

[shilman]

Nice! But instead of the 📡 icon, how about a ⏯ button?

[ndelangen]

📢

[codecov]

Codecov Report

Merging #1249 into master will decrease coverage by 0.01%.
The diff coverage is 0%.

@@            Coverage Diff             @@
##           master    #1249      +/-   ##
==========================================
- Coverage   13.75%   13.73%   -0.02%     
==========================================
  Files         207      207              
  Lines        4632     4638       +6     
  Branches      512      606      +94     
==========================================
  Hits          637      637              
+ Misses       3544     3487      -57     
- Partials      451      514      +63

Impacted Files	Coverage Δ
addons/events/src/components/Panel.js	0% <ø> (ø)	⬆️
addons/events/src/components/Event.js	0% <0%> (ø)	⬆️
lib/ui/src/modules/ui/configs/init_panels.js	25% <0%> (ø)	⬆️
addons/knobs/src/components/PropField.js	10.86% <0%> (ø)	⬆️
app/react/src/client/preview/init.js	0% <0%> (ø)	⬆️
addons/knobs/src/components/PropForm.js	8.51% <0%> (ø)	⬆️
app/react/src/client/preview/error_display.js	0% <0%> (ø)	⬆️
app/react/src/client/preview/reducer.js	0% <0%> (ø)	⬆️
addons/info/src/components/markdown/code.js	0% <0%> (ø)	⬆️
lib/ui/src/modules/ui/components/layout/usplit.js	38.7% <0%> (ø)	⬆️
... and 22 more

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