Update templates to Aardvark v5

[gsomix]

Project files for Aardvark v5 look cleaner, but still have some weird explicit dependencies:

• on FSharp.Data.Adaptive; should disappear after https://github.com/fsprojects/FSharp.Data.Adaptive/issues/71 resolved;
• on SourceLink.Embed.PaketFiles; shoud disappear after https://github.com/aardvark-platform/aardvark.base/issues/47 and https://github.com/aardvark-platform/aardvark.media/issues/32 resolved.

I have also experimented a little with Paket as dotnet tool and Paket-based templates. It works fine but need more work on projects structure (introduce solution + F# project + Paket files) and also complicated build process a bit (first need to restore tool, then install deps and so on). So I decided to not go this way for now.

cc @haraldsteinlechner @krauthaufen What do you think?

[krauthaufen]

Looking good, @haraldsteinlechner merge if you're also happy with it...

[haraldsteinlechner]

awesome thx

[gsomix]

Thank you for the review!