Eventio

Monkey patch for zstandard memory leak, see 168

Add `tell` method to `PipeWrapper` to make it a valid file object

* Use gzip subprocess instead of gzip module by default, speeds up reading gz files by ~20%
* Remove unnecessary logging call in reading function, ~ 5% speed up
* Use explicit types from stdint.h for cython code to improve readability

* Do not read timestamp of `History*`, in `__init__`. These objects do no longer have
a timestamp member, but their `parse` methods return a tuple of `timestamp, content`.

* Refactor `iact.ArrayOffsets` to use the version header field instead of guessing the number of columns.

* Improve printing of objects (`__repr__` shows Low-Level eventio info, `__str__` shows higher level object info, improved printing utils)

* Make sure all telescope descriptions are read in `__init__` of `SimTelFile`
* Several low-level code improvements, e.g. raising earlier if a big-endian file is encountered

* Fix missing laser calibrations and camera monitorings in `SimtelTelFile` for calibration events