Allow sile-sink to be build for packaging to npmjs.com and add more documentation and examples (#36)

Takes a package name and a dest path. This way we can more eassily change the
layout and it will error out on package name typos or missing packages.

They were hardcoded in more places

Add a scope so we don't have to care about naming conflicts
and set the verison to 0.1.0 since we don't have a stable API yet.

Use tdd in all cases to be more consisstend.
Also since last year we can use chai with rollup directly, so
do that everywhere instead of relying on karma-chai injecting
it in to the global scope.

Instead of hardcoding the paths of the node_modules directory we use the node-resolve
plugin of rollup to find the root of the corresponding JS package and calcucate a path from
there.

Resolving a package requires calling an async function, so we have to use await in the rollup config.
Luckily rollup supports configs wrapped in a promise, so we just have to wrap it in a function which returns
a promise.

Bekerle, Patrizio authored 4 years ago and Reiter, Christoph committed 4 years ago

Nextcloud filepicker ui

See merge request VPU/WebComponents/FileHandling!2