Switch to c++20 and don't allow building with c++17

See merge request !16

ci: Add basic setup for pre-commit and homogenize formatting

See merge request !14

Fix warnings and make CI flag warnings as errors

See merge request !13

- Use non-deprecated functionality from Geant4
- Refactor and de-duplicate functionality in two angle BIBAE model

Add two angle BIBAE models for running in an ILD like detector

See merge request !11

- Add trigger functionality to refine the trigger decision that is already provided by DD4hep. Can be used to e.g. exclude certain regions in the detector

Add a basic CI setup

See merge request !12

Simplify path to ONNXruntime headers

See merge request !9

add angle conditioning

See merge request !6

 - use true for GAN and Par04VAE
   - false for the BIB-AE

 - now have working example for BIB-AE conditioned on one angle

 - don't correct for angular direction in
   geometry models

Bibae correct

See merge request !5

Add the possibility to instrument the steps of modelShower

See merge request !3

# Conflicts:
#   include/DDML/FastMLShower.h
#   scripts/ddsim_steer.py

Make the default install prefix ../install

See merge request !2