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Platform independent access to information about the current operating system.

## Querying the current OS

Exposes `operatingSystem` and `operatingSystemVersion` strings similar to those
of the `Platform` class in `dart:io`, but also works on the web. The
`operatingSystem` of a browser is the string "browser". Also exposes convenience
getters like `isLinux`, `isAndroid` and `isBrowser` based on the
`operatingSystem` string.

To use this package instead of `dart:io`, replace the import of `dart:io` with:

```dart
import 'package:os_detect/os_detect.dart' as os_detect;
```

That should keep the code working if the only functionality used from `dart:io`
is operating system detection. You should then use your IDE to rename the import
prefix from `Platform` to something lower-cased which follows the style guide
for import prefixes.

Any new platform which supports neither `dart:io` nor `dart:html` can make
itself recognizable by configuring the `dart.os.name` and `dart.os.version`
environment settings, so that `const String.fromEnvironment` can access them.

## Overriding the current OS string

It's possible to override the current operating system string, as exposed by
`operatingSystem` and `operatingSystemVersion` in
`package:os_detect/os_detect.dart`. To do so, import the
`package:os_detect/override.dart` library and use the `overrideOperatingSystem`
function to run code in a zone where the operating system and version values are
set to whatever values are desired.

The class `OperatingSystemID` can also be used directly to abstract over the
operating system name and version. The `OperatingSystemID.current` defaults to
the values provided by the platform when not overridden using
`overrideOperatingSystem`.