[url_launcher_web] Adds "tel" and "sms" URL support (flutter#2847)

[connectivity_for_web] Introduce connectivity_for_web package. (flutt…

…er#2820)

Move the package formerly known as `experimental_connectivity_web` to flutter/plugins master, as `connectivity_for_web`.

Update README for plugin list (flutter#2843)

[e2e] Fix e2e pixel ratio (flutter#2842)

* Fix e2e device pixel ratio

* Update changelog and version

* Formatting

[url_launcher] docs: note about encoding URIs (flutter#2172)

Add a note about encoding URLs passed to the url_launcher in the packages README.

[path_provider] Updated documentation reflecting changes needed for t…

…esting (flutter#2815)

The recent federation of the Linux path provider might break tests, this updates the README.md to address those changes and direct the users how to mock the plugin in their tests.

[image_picker] fixes for iOS which doesn't present camera/albums with…

… more complex navigation (flutter#2755)

[image_picker] Add web support to the example app. (flutter#2816)

[image_picker_for_web] Remove android directory. (flutter#2817)

[image_picker_for_web] Introduce image_picker_for_web package (flutte…

…r#2802)