Add an example of how to use webdriverio with electron

There was some confusion about the correct way to add an `All Files` filter (see #2525), so I added it to the example.
Also added a short note about the extension syntax.

This is related to PR #2547.

When I first tried to add something to the C++ code, I was a bit overwhelmed by all the special types and abstractions.
The info added will hopefully make it a bit easier to start, by directing users to the right place.

This resolves #2293.

One of the tests failed because in one of the paths the drive letter was
upper case `C` and in the other it was lower case `c`.
Paths in Windows are case insensitive, so this shouldn't fail. The fix
was to lower case the paths before comparison (only on Windows).

Organize Documentation Translations

Make sure guest view is destroyed immediately when embeder is closed

This reverts commit d7fda9c.

Fix important typo and update as upstream

nativemate: increase recursion depth

win: Add compatibility information in manifest file

This fixes app.quit() not working when it is called before the message
loop starts to run.

win: Delay quitting until next tick of message loop

This reverts commit 1d148fe.

Fix debugger not working for main process

It frees us from using C++ to track JS objects, thus improves the
performance of collecting memory.

It is failing in Travis CI but not in GitHub CI or my own machine,
ignore it for now.

Optimize memory usage when using remote module

Add webFrame.setZoomLevelLimits API

Opt into location services