Simplify multi-keyword commandlets and make usage consistent

[hohwille]

From #5:

Currently ide set mvn version 3.9.3 sets the maven version to 3.9.3.
Each commandlet must have a unique name that should also give an idea what the commandlet is about.
Currently I named this commandlet set-version what seems to make sense.
Also this would allow later to also have a ide set intellij edition ultimate that would be handled by a set-edition commandlet.
As a result you would need to type ide help set-version to get the help of set-version commandlet and ide help set-edition to get the help of set-edition commandlet. Would it then be better to also change the command syntax to ide set-version mvn 3.9.3 and ide set-edition intellij ultimate? IMHO this would avoid some user-confusion.

As I did not get any feedback, I now decide that we should go for this approach as it will make our life easier and the help and usage more consistent. A little drawback is that ide set mvn version 3.9.3 is a little bit more natural language than ide set-version mvn 3.9.3. However, if we later think this is relevant, we can still add some CLI alias syntax concept that allows to have ide set mvn version 3.9.3 as a kind of alias to ide set-version mvn 3.9.3 what would still be the primary syntax.
FYI: Feel free to also change VersionSetCommandlet to SetVersionCommandlet, etc. if that makes more sense for you then.