Nix support and space leak fix

• Consume and forward all available messages from Producers on each cycle.
• Add Nix and GitHub Actions support (thanks @smunix!).
• Fix space leak when rebuilding the UI or handling events.

Use the recently published nanovg-0.8.0.0 from Hackage, instead of the version from the PR's commit.

• Use the recently published nanovg-0.8.0.0 from Hackage, instead of the version from the PR's commit.
• Added appRenderOnMainThread option.

Export configuration types to have Haddock generate documentation

1.0.0.1

Export configuration types to have Haddock generate documentation

Initial public release

• Supports Windows, Linux and macOS