Kirby plugin (bundles), plugin repositories and meta-data

First work in progress: https://github.com/distantnative/package-manager/
Just put it into site/widgets/package-manager/ (until we have bundles :wink: )

So far it only lists all Plugins, Fields and Widgets and tries to get the name from a package.json with fallback to the file/folder name. Should not be seen as a ready widget but more as a work in progress to see what functions, ideas, other ways to do it we can think of. So any contributions (if code, if comments…) are more than welcome and appreciated!