Merge branch 'develop'
omnetpp: update python to python3
readme: update todo and add flake description
inet: update to 4.2.8
ops: update to 20211019
dev/nix: add flake
dev/nix: add flake
omnetpp: update to 5.7
omnetpp: update to 5.7
nix: stdenv.lib is deprecated.
Add LICENSE
omnetpp/keetchi: withDoc as false
update readme
update ops
update ops
patch shebang
revert patch
patch from forking one https://gitlab.com/eyJhb/omnetpp-nix/-/commit/44959d146c038fa9275ad0b9d9de6f3991d3a0d5
fix omnetpp wrap, because the configure script dont read OMNETPP_IMAGE_PATH
revert patch files, which is easy