Add latest feature/fixes from Lottie-Android (xvrh#209)

- Added support for rounded corners on shapes and rects
- Add support for text in dynamic properties (ValueDelegate)
- Improve stroke with offset
- Add support for reversed polystar paths
- Enforce order of operations to avoid rounding errors

Add pubignore

fix: Revert Cubic to PathInterpolator.cubic (xvrh#173)

Format changelog

Fix publish script

Implement computeDryLayout (xvrh#141)

Prepare version 1.0.0 (xvrh#136)

Fix web version (xvrh#135)

Add an image delegate to dynamically change images (xvrh#130)

And allow to use an imageProviderFactory with a zip file.

Remove prints (xvrh#129)