Merge branch 'issue-2018' into calamares

src/libcalamares/GlobalStorage.cpp

src/libcalamares/GlobalStorage.h

src/modules/partition/Config.cpp

src/modules/partition/PartitionViewStep.cpp

src/modules/partition/core/PartUtils.cpp

src/modules/partition/core/PartUtils.h

src/modules/partition/core/PartitionActions.cpp

src/modules/partition/partition.conf

src/modules/partition/partition.schema.yaml

src/modules/partition/tests/1a-legacy.conf

src/modules/partition/tests/1b-legacy.conf

src/modules/partition/tests/2a-legacy.conf

src/modules/partition/tests/2b-modern.conf

src/modules/partition/tests/2c-mixed.conf

src/modules/partition/tests/2d-overlap.conf

src/modules/partition/tests/CMakeLists.txt

src/modules/partition/tests/ConfigTests.cpp