* Rename `*NodeFactorsBuilder` to `*PreBasisFactory`
* Rename `*FactoryTag` to `*PreBasisFactory`
* Rename `build()` to `makePreBasis()`
* Make `makePreBasis()` `const`
* Make implementation of `BasisBuilder::composite()` more readable.
* Fix `BasisBuilder::composite()` and `BasisBuilder::power()`.
  Both did not store the `ChildPreBasisFactory` objects
  but recreated them using default-construction during
  `build()`. This prevented stateful `ChildPreBasisFactory`
  implementations. Now the passed `ChildPreBasisFactory`
  objects are now stored and used during `makePreBasis()`
  such that stateful `PreBasisFactories` should work.
* Hide internal members of `PreBasisFactories`
* Use return type deduction for all `PreBasisFactory`
  creation helpers. This makes the code much more readable
  and also hides the concrete `Imp::*` return type
  from the use.
* Add utility `applyPartial()` which is like `std::apply`
  but allows to select the tuple entries to be used as arguments

This is what you need to do to update your code:
* If you only use the `makeBasis()` mechanism this will
  work as before.
* If you explicitly constructed the `*Builder` classes in your code,
  you must follow the renaming.
* If you explicitly used the `build()` methods, you have to
  change this to `makePreBasis()`
* If you implemented your own `FactoryTag`/`NodeFactoryBuilder`/`PreBasisFactory`
  to hook into the `makeBasis()` mechanism, then you have to
  rename `build()` to `makePreBasis()`.