[pointer_interceptor] Shadow dom tweaks (flutter#364)

Update README.md for flutter_lints (flutter#358)

Add additional Windows template icons (flutter#357)

Updates to version 3.0.1

Add example to flutter_lints package (flutter#354)

Merge pull request flutter#348 from stuartmorgan/import-flutter-image

[flutter_image] Import from flutter/flutter_image

[pigeon] cleaned up gitignore (flutter#352)

Prepare flutter_lints for 1.0 release (flutter#349)

Add flutter_lints package (flutter#343)

Merge pull request flutter#334 from stuartmorgan/import-css-colors

[css_colors] Import from flutter/css_colors

[pigeon] moved command line logic from bin/ to lib/ (flutter#313)

* [pigeon] moved the logic from bin to lib to help others wrap the
command-line tools logic with their own logic.

* Added a linter ignore