Remove Swift dependency (flutter#2580)

[webview_flkutter] remove ios workspace setting

[device_info] add PackageManager's SystemFeatures to AndroidDeviceInfo (

flutter#2567)

There's a variety of scenarios where checking at runtime which system
features are available is useful.  System features are device
capabilities that do not change at runtime (for example, FEATURE_BLUETOOTH
is always present if the device has a bluetooth radio, even if Bluetooth
is presently disabled), so DeviceInfo seems like the right place to put
this.

Missing files

[path_provider_platform_interface] Rename back to StorageDirectory (f…

…lutter#2564)

* Rename StorageDirectory

* Update version

* Update version to non-breaking

* Use 1.0.1

format fix

[path_provider_macos] Adds example app (flutter#2559)

* Add macos  exmaple

* Update version

* Fix analyzer

* Fix

* space

* Remove tests

* Address comment

* Remove show

* Import

* Add platform

* Use right import

[connectivity_platform_interface] Add `ConnectivityResult.unknown`. (f…

…lutter#2560)

Some platforms might not be able to determine the connectivity status of
the device on which the app is running (like some desktop Web browsers).

This allows users of the `connectivity` plugin to distinguish between
"no connectivity" and "connectivity couldn't be determined".

This requires a Major Version bump for users of the plugin who may be
switch/case on ConnectivityResult values, since Dart forces users to be
exhaustive in those cases (if they don't have a "default" entry, this
new value becomes a compilation error in their code).

This will also cause a Major Version bump in the core `connectivity`
plugin itself.

Note that by default, the ConnectivityResults returned by the MethodChannel implementation will now default to 'unknown' if they're not explicitly "none", so this might have some effect in your code!

[path_provider] Create platform interface (flutter#2553)

[e2e] fix flutter driver code snippet in readme and improve formattin…

…g of code snippets (flutter#2549)

* [e2e] fix flutter driver code snippet in readme and improve formatting