Add analysis_options.yml to the project and fix linting

[mark-nicepants]

First of all, really appreciate the hard work! Really cool to see that we can have truly 3d capabilities in Flutter!

If we want to have this package take off, I suggest to add some form of linting to clean up the code a bit. My suggestion would be to make a separate branch, and enable only 1 or 2 rules at first. After thats in place keep on adding more rules to improve the code quality. I would be more than happy to help out and get this going.

If you want I can start with adding an analysis file and adding return types and getting rid of dynamics where I can. Would that be something that would be appreciated?

[wasabia]

It's cool! feel free to start it.

[renancaraujo]

Hello @wasabia, Thanks for your hard work. I also saw myself having concerns regarding code quality and performance when doing this.

With the lint rules that are already established, we get 1700 violations only in this repo, let alone flutter_gl.

So before opening any pull requests, are you open to a large-scale contribution to improve the codebase quality?

[wasabia]

@renancaraujo Yes Contributions of any kind welcome!

[mark-nicepants]

First batch of lint fixes are now merged via https://github.com/wasabia/three_dart/pull/95.

More to come in the coming days/weeks. After that we can try to work towards elliminating all dynamic references and make the package more solid.

[mark-nicepants]

Second batch of lint fixes just landed. Ill create a new ticket for moving away from dynamic types