Make pmp and pmp_vis usable as a git submodule / cmake subdirectory

[mokafolio]

Description

Replaced all include_directories calls in the cmake files with target_include_directories so that the targets can properly be used with cmake add_subdirectory and properly propagate include directories. This allows to you add pmp as a git submodule to your project. I tested my changes on osx, Ubuntu 22.04 and Windows 11 for both local and install builds.

Motivation

Because using pmp as a git submodule/cmake subdirectory makes it a lot more versatile.

Benefits

See above.

Drawbacks

N/A

Applicable Issues

N/A

[dsieger]

Looks like a good step forward to improve our CMake code. I'd like to do some more manual testing. Similar as with the other PR: Please sign off your commits with a DCO so that we can include your changes.

Thanks!

[coveralls]

Coverage: 92.607%. Remained the same when pulling 00e2b35 on mokafolio:moka/cmake_improvements into b5332d8 on pmp-library:main.

[dsieger]

Quick update: I had a look and there are some issues that need fixing. In particular, it breaks the cross-compilation to JavaScript using emscripten. This is due to linking imgui with glew directly. I'll check how I can include additional changes in the PR.

[mokafolio]

Sounds great, that was the one thing I didn't check!

[dsieger]

There were too many conflicts to resolve this easily. I therefore squashed your changes and my fixes into a single commit 4625b47 . Hope that's OK and please let me know if this is sufficient for your use case.

[mokafolio]

Just tested it and it seems to work, thanks!