start using libformfactor

Polyhedron, associated classes, and some tests moved to external library.

added 3 commits

• 290166f3 - corr
• cdd21e29 - more readable
• 9c4c204d - single-use test ff-triangle moved to libformfactor

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added 2 commits

• 5378f556 - wip
• 9f9ec52b - using ff, but numeric failures

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added 32 commits

• 9f9ec52b...0a7d3579 - 24 commits from branch develop
• db682df6 - Take COmplex.h and Vectors3D.h from LibHeinz
• 36395b8f - LibHeinz include_dir -> singular
• 674b6772 - don't use internals of Vec3
• 9143545a - corr
• bcdad5a5 - more readable
• 304a5619 - single-use test ff-triangle moved to libformfactor
• 801e1b67 - wip
• 0c403f97 - using ff, but numeric failures

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added 9 commits

• 0c403f97...e9c22e4a - 6 commits from branch develop
• a78b2198 - single-use test ff-triangle moved to libformfactor
• ac43392e - wip
• c8e1fbce - using ff, but numeric failures

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added 1 commit

• 55e216b5 - CMake: print ff_lib

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added 1 commit

• 64e8d9f7 - link formfactor

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added 19 commits

• 64e8d9f7...5bbff90a - 14 commits from branch develop
• a77e8cb0 - single-use test ff-triangle moved to libformfactor
• a1f54db5 - wip
• b87bea11 - using ff, but numeric failures
• b8b05761 - CMake: print ff_lib
• 27f590c4 - link formfactor

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added 1 commit

• ad9ac685 - CMake: formfactor provided as target

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marked this merge request as ready

changed title from WIP: use libformfator to start using libformfactor

changed the description

added CMake Core labels

mentioned in commit 8f64a282

merged