Simplify static creation methods

[minnerbe]

These are some notes from discussing #349 with @tpietzsch regarding simplifying the existing image-creation API:

• Move static creation methods to their respective interfaces as static methods, as done, e.g., in java.util.List.of() (introduced in Java 9).
• Deprecate and ultimately delete static utility classes with a trailing 's' (ArrayImgs, Intervals, ...).
• Consider renaming some of the methods (e.g., ArrayImg.of(double[], long...) instead of ArrayImg.doubles(double[], long...)).
• Consider placing some of the static creation methods in the highest level interfaces (e.g., Img instead of ArrayImg) to spare first-time users some implementation details (see also Add convenience methods for creating images from arrays #349).

Let me know if I can help with anything in this regard.