[Web] Regression testing infrastructure

[mcdurdin]

Is your feature request related to a problem? Please describe.
KeymanWeb needs to have more solid regression testing for keyboard layouts so we can refactor and update the compiler with more assurance.

Describe the solution you'd like
A set of regression tests based on the keymanapp/keyboards repo keyboards that can be run automatically, ideally on Node, but initially through a web driver.

Describe alternatives you've considered
Manual testing? Um...

Product context

• OS: any (browser-based)

Additional context
I have some WIP code for generating test cases for keyboards (kmanalyze) -- will reference here once I create the PR. The infrastructure to run the tests needs completion. The existing Keyman Developer-based regression testing is insufficient as it is Windows-based. Anticipate being able to run tests based on both touch and hardware events in the future.

[jahorton]

Was addressed with #1697 and some further updates. We're satisfied with the state of regression testing for KMW at this time.