[gmx-developers] GROMACS modularization improvements: CMake targets

[Mark Abraham]

Hi devs!

Some module reorganization is in order so we can do a better job of a few
things:
* expressing the differences between installed, module-interface, and
module-internal headers through filesystem location
* using per-module CMake targets for better control of things like
compilation flags
* avoiding test binaries depending on all of libgromacs
* fewer custom CMake functions for managing all the above

Please consider whether you can contribute to the effort, and fill out the
poll at https://doodle.com/poll/56b26yepmxrhe6ny

The goal for the day is to remove `src/` from all INCLUDE_DIRS by
reorganizing the module-interface headers and CMakeLists.txt files for all
modules.

Moving forward, in order for `moduleB` sources to `#include
"gromacs/moduleA/header.h", the CMakeLists.txt for `moduleB` will need a
`target_link_libraries(moduleB PRIVATE moduleA)` (or
`target_link_libraries(moduleB PUBLIC moduleA)`, if `moduleB` needs to
convey transitive dependency on `moduleA` to moduleC that depends on
moduleB.

Some preliminary discussion can be found at
https://gitlab.com/gromacs/gromacs/-/issues/3288 and we have a working
document at
https://docs.google.com/document/d/1L5Ur8HybxqfglKLdaKgYrc1_RMPFtNAM0qpnijUHsb0/edit?usp=sharing

Mark
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