atft library doesn't export its members in TypeScript

[ComFreek]

Describe the bug
https://github.com/makimenko/angular-template-for-threejs/blob/master/projects/atft/src/public_api.ts doesn't export all the directives and components.

Implications are

1. you cannot use those directives in the app, e.g. if you want a @ViewChild(WebGLRenderingComponent) (as in my test code for Object Selection #36), and
2. in app.component.html you'll see lots of errors shown by Visual Studio Code:
   

Expected behavior
Export all directives and components in public_api.ts. Now that we have a public package published, we should be cautious with modify the API without adhering to semver. If in doubt, make all properties/methods private first.

Suggested fix
For every subdirectory of projects/atft/lib create an index.ts exposing the public API. E.g. projects/atft/lib/cameras/index.ts, then in public_api.ts do export * from './lib/cameras.

[makimenko]

Please check,
I hope it's ok now

[makimenko]

@ComFreek added you as collaborator to npm library (invitation sent to email). Feel free to publish changes to npm.

[ComFreek]

@makimenko Looks good to me! Thanks for your trust in me. I didn't get any email though! I've already checked all my other email addresses and junk folders 😄

To adhere to semver, we should publish the changes as v0.1.0. Also the tag v0.0.3 for atft@0.0.2 is confusing, see the newly created CHANGELOG.md. I've drafted a GitHub release: https://github.com/makimenko/angular-template-for-threejs/releases Does it look okay for you?