Simplify installation path configuration

[eessmann]

Removed unnecessary path normalization and appending for installation.
closes #696

[otbrown]

Thanks for this Erich, I have two minor requests before merge:

• Not related to your changes but I see line 578 of CMakeLists.txt says ## RATH instead of ## RPATH!
• Could you change the executable we always build to be quest-min-example rather than min_example. If no CMAKE_INSTALL_PREFIX is set this will now end up in /usr/local/bin so we should namespace it...

[otbrown]

Making the binaries specifically still be prepended by quest/ would also be fine I think, although is possibly more faff! Though actually I'm now realising that all the examples may end up dumped in /usr/local/bin so we probably do want to make sure a quest gets inserted in there 🤔

[eessmann]

I don't think we should install the executables, they are all just examples.

[otbrown]

Good point. I was pondering over the weekend, and I can think of one or two awkward workflows where the user might want binaries installed too (i.e. when the user sets an install prefix and is using the USER_SOURCE option), so rather than remove the binary install entirely I was thinking ye olde create a CMake option.

option(INSTALL_BINARIES "Whether to include example and user binaries in the install." OFF) means the default behaviour is unsurprising, but people are supported in being weird without having to modify the CMake themselves.

[eessmann]

Oliver, I’ve added your suggested option so we’re now conditionally installing the examples. I’ve also made it so that if we’re the top-level CMake project, we set the type of library we build to shared.

I encountered a bug when using Quest with the CMake FetchContent feature; Quest’s BUILD_SHARED_LIBS setting leaked into my build.

[otbrown]

Excellent, thanks Erich!