Entirely replace LiteSQL

fix #3271

Simplifies the CMakeLists.txt a little bit

fix #3266

fix #3266

Because it would overwrite the user file when installing a new version.  And
it’s basically useless anyway, because if the file doesn’t exist at all,
biboumi will write an helpful message on stderr, telling the user to create
the config file.

fix #3234

This way, the user is always up to date, instead of being a duplicate out of
sync.

fix #3258

fix #3236

fix #3219

fix #3250

fix #3219

fix #3261