Fix #1345 - Improve developer experience when starting from webpack

[bryphe]

A few fixes:

• Refactored some of the launch logic out to a bootstrap script, with a loading animation
• Ping the webpack-dev-server periodically, and once we have the script, ensure that the UI is starting up

In addition, this adds an alternative mechanism for debugging:

• npm run build-debug
• npm run launch

This doesn't give the hot-reload functionality, so you'd have to run npm run build-debug after each change, but it's nice to have an alternative in case there are webpack issues..

[bryphe]

Should fix #1345 and #1626

[codecov]

Codecov Report

Merging #1663 into master will increase coverage by 0.04%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #1663      +/-   ##
==========================================
+ Coverage    46.1%   46.14%   +0.04%     
==========================================
  Files         117      117              
  Lines        4449     4453       +4     
  Branches      638      638              
==========================================
+ Hits         2051     2055       +4     
  Misses       2253     2253              
  Partials      145      145

Impacted Files	Coverage Δ
browser/src/Services/Snippets/SnippetManager.ts	52.08% <0%> (-1.92%)	⬇️
browser/src/Services/Snippets/SnippetSession.ts	68.8% <0%> (+1.57%)	⬆️

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