* Introduce `EventIOFile.peek` to look at the next eventio object in a file without advancing the iterator.
Beware, that this might prevent from reading the previous object if the file is not back-seekable.
To be safe, only call peek *after* reading/parsing the current object.
* Fix that `SimTelFile.iter_mc_events` had the wrong `TelescopeData`. It always used the last available, which was either the one from the previous event or even older since events might not have `TelescopeData` at all