- reticle.test.js - focus leaflet container with page.focus()

- axisInferring.test.js - use EPSILON value of 0.0000001 for comparison of
gcrs coordinates

- queryLink.test.js - use .click(selector, {force: true} ).
See https://playwright.dev/docs/input#forcing-the-click for why this might
be a problem, seems to only be a problem on firefox.

- featureLinks.test.js - simplify, get running on firefox

- run all tests on chromium and firefox

- layerContextMenu.test.js - does not fix underlying issue with layer 
context menu, but eliminates other issues.

- viewerContextMenu.test.js - does not fix underlying issue with the
context menu, which is due to a playwright bug, but simplifies the code
a little bit.  Should run when the latter bug is fixed in playwright 1.19

Clean up context menu code that is non-functional (I think).

Upgrade playwright to ^1.17.0