v0.3.4: Add IteratorAggregate usage for SelectEntries

Makes it possible to leave out the explicit getIterator call
when using SelectEntries.

Remove type hints

Remove some not really necessary type hints which confused code analyzers, like PHPStan, when generated repositories were used.

Release for 100% test coverage

Now that we have everything tested it makes sense to have a new bugfix release - no functionality change.

Fix repositories script & fetchOne limit

Script was broken due to directory move, and fetchOne limit is now removed because it is not really necessary and could break things (COUNT(*) queries for example).

Unify interfaces & improve tests

Try to have an unified interface, also compared to the Queries component, so this adds and changes quite a bit! Still not sure if everything will stay exactly as it is now, but we are getting there.

First official release

Some parts are still missing:

- Complete test coverage (although it is quite far along)
- Sensible documentation
- There might still be some errors in existing class
  documentation, as things were hurried a bit to finally have
  an official release

That is why this is a 0.2 release, meaning we are not sure yet
if everything will stay exactly the same.