Improve cpp CMakeLists.txt

[kyle-verdant]

Public-Facing Changes

Removes pointless INSTALL step inside CMakeLists.txt, sets the library to be explicitly static.

Description

Default for libraries in CMake is STATIC. Installation of static libraries is pretty pointless - if it's desired to key off of BUILD_SHARED_LIBS or similar, I recommend only installing if built as shared, use CMAKE_LIST_DIR to properly support add_subdirectory, and to rename LICENSE on install to FOXGLOVE_LICENSE or similar. This came up trying to use CPM to install (FetchContent would have similar issues)

[CLAassistant]

All committers have signed the CLA.

[achim-k]

@kyle-verdant Some of the CI jobs are failing, could you look into these?

[jlack1987]

I think we shouldn't remove the install lines no? That would break the cmake install target and will break the usage for ppl that are using this as a pure cmake project.