opp_env
- add nix package and a flake file (use `nix shell` to start an opp_env enabled shell)
- change into project directory when using 'opp_env shell' command without any project arguments
Database (Frameworks and Models)
- obs: build properly in both release and debug (still only tested in debug due to segfault)
- dns, tcp_fit_illinois: build and test properly in both release and debug
- rspsim: build tools in toolchain directory
- streetlightsim: build and test in release and debug
- added rspsim-6.1.3
- solarleach: only build in release, because omnetpp 3.3 has no distinct debug/release
- added castalia-3.3pr16. This is the 3.3 version ported to omnetpp-5
- inet-3.4.0: removed omnetpp-5.0.* from dependencies due to build error
- inet: use another example for smoke test; also properly test release and debug
- added from-git-option to simu5g, simulte, fico4omnet, ansa, core4inet, simproctc, rspsim, ops and rina
- added newer version for core4inet (240124)