upgrade electron 7.3.2 -> 10.1.2

[mason-fish]

fixes #1044

Upgrades Electron and Spectron by 3 major versions. Also of note, is the underlying webdriverio dep is upgraded by 2 major versions (4.xx -> 6.xx).

Here are some of the breaking changes:

Electron

• remote module is disabled by default now, and must be explicitly enabled for each browser window, this module is flagged to be deprecated and moved. More information on it's proposed future here
• as of electron 9, sending complex objects over ipc will now throw an error. Previously the pieces which could not be serialized would just be silently dropped and was the source of a few bugs we've encountered in the past. So this is a welcome change, we now add .serialize() and deserialize() methods to classes when we have to send them over the ipc wire. This is also a useful pattern for persisting app state, since we encounter the same problem there.

Spectron

• It's difficult to say how much of this is spectron and how much is chromedriver, but there are several new OS dependencies we need to install on centOS for our iTests to even begin to run. Thanks @jameskerr for chasing that down!
• We also need to set the "--no-sandbox" flag since our tests are being run by the root user inside our CI container.
• Previous versions of Spectron would create the directory provided as webdriverLogPath if it didn't exist but the current version does not, now we create it ourselves

Webdriverio (provides the primary api we use to programmatically interact with a browser)

• Entire api has been "promisified", in some cases this allows us to simply await apiMethod() instead of using our own retry layers. Though this is not always the case.
• api has also been refactored from browser.method(selector, methodOptions) -> browser.$(selector).method(methodOptions) in terms of the method input pattern. Since we are using async mode, this also means each method must be awaited/handled as a promise.
• there are also several name changes, and in some cases methods have completely been removed and require us to write our own, see the changelist here

[jameskerr]

I think this file can be deleted now. The zealot stuff lives in dist/index.js

[jameskerr]

Just one comment to delete the old zealot/index.js but then ship it!