This really isn't useful, and we want to get rid of it in the external
interface as well.

Generate a header containing the private QDLDL config options

Add symbol visibility information to all the functions that are exported

Add new GitHub actions badge, remove Travis/Appveyor badgers, update URL for code coverage badge.

We don't upload coverage from them, so don't compute it.

Since the unit tests use the static library, they can't be built
if we don't build the static library.

This flag isn't as generic as the previosu one.

When QDLDL is included in OSQP, only the object library is used and
the libraries and executables can actually pose issues when compiling
for embedded targets.

Include version information in CMake and the program

Updated OSQP bibtex entry