instead of having to hope users save an installation log before leaving live mode,
this commit gives distributions the option to have a full calamares -d log available on
the newly installed system
see the readme.md for details
this is fully tested and working properly, using the example launcher script & .desktop line
as noted in the readme
Module descriptors are now module.desc, no configuration allowed inside.
Module config files are <modulename>.conf, installed in
share/calamares/modules.
settings.conf is read from /etc/calamares, then share/calamares, and if
running with --debug also in the current dir.
Module config files are read from /etc/calamares/modules, then
share/calamares/modules, and if running with --debug also in
src/modules/<modulename> relative to the current dir.
