Update Finds modules to provide "imported targets" __MORSE::FOO__ when a package FOO is found see the documentation in file morse_cmakefind_doc.org.

Remove Find related to libraries that rely on CMake and which must provide its own FOOConfig.cmake at installation.
Relying on the old FindFOO.cmake is a really bad practice, FindFOO.cmake are reserved for package that are not compliant with CMake.