Refactoring louloulibs and cmake

Use OBJECT libraries
Remove the louloulibs directory
Write FOUND variables in the cache

Add a make coverage target to merge all other coverages, and upload to codecov

Do not remove the .info generated by lcov

Fix the indent in the coverage.cmake file

[skip-ci]

Remove build/* from the coverage, because that code isn’t part of biboumi

Mark some more cmake variables as advanced

Clean the list of options visible in non-advanced ccmake

Make lcov gcov etc optional

make coverage will display an error instead

Add code coverage support

make coverage runs the test_suite and generates a report

Introduce an optional Database module

Uses litesql

Remove all the libs that are now in louloulibs

Add the FindCARES cmake module

Fix the cmake LIBUUID_INCLUDE_DIRS value when we are not using pkg-config

Improve dependencies checks in the build process

- Rename all Find*.cmake files to uppercase, to make things more consistent,
  and fix some issues with them (notably the REQUIRED flag)

- Rename SYSTEMDDAEMON to SYSTEMD and only use the libsystemd instead of
  libsystemd-daemon because it's deprecated for a long time now

- Provide a WITH_* and WITHOUT_* switch for all optional dependencies

- Document things in the INSTALL file

Properly search for libbotan even in a botan-1.11 subdirectory

Implement TLS support using Botan

For now, it tries two TLS ports and then connects to the non-tls port.  In
the future we would like the user to be able to configure that.

fix #2435

Use libuuid to generate unique IDs for iq and adhoc sessions

Use pkg-config first to find libraries

Link with systemd instead of systemd-daemon

Add support for systemd-daemon