refactor(core): migrate to standalone Angular app

[dorthrithil]

Drops all modules and updates all components etc to standalone versions.

[dorthrithil]

@BlobbyBob FYI, this is basically finished now, waiting for your feature to be merged, then I'll fix the conflicts and merge this as well. After that we have a modern standalone Angular app 🥳
Maybe interesting is, that in the standalone app it's not supported anymore to use pipes inside of components. Had to refactor there and move some functionality in a service + implement the async pipe feature myself in the respective pipes.

[BlobbyBob]

Nice, good work 🚀

Maybe interesting is, that in the standalone app it's not supported anymore to use pipes inside of components.

How exactly do you mean that? If it's not possible to use pipes inside components, what is their use then? :D
The code changes look like you did not change a single pipe usage in HTML, but only their importing and implementations

[dorthrithil]

Oh haha, that's what I meant. :D Of cause it's still possible to use them in the templates. But I got null injector errors trying to use transform of injected pipes inside the transform method of another pipe. But thinking about it again, maybe I just needed to provide them properly? Not sure anymore if I did that. Will check that again