Add DanglingLineData and TwtData (#379)#432

sebalaig wants to merge 4 commits into

integration/v1.6.0powsybl/powsybl-iidm4cpp:integration/v1.6.0from

issue379-vAndAnglepowsybl/powsybl-iidm4cpp:issue379-vAndAngleCopy head branch name to clipboard