I grepped out all flags which are actually defined/used in lumiera and
refactored them into one big tree here. There are some annotations and
issues which shall be finally resolved. Please check if the intended
hierarchy looks OK this way and add more flags when you think some are
missing. I chosen to make a quite verbose hierarchy, this doesnt cost much
in nobug and adds some flexibility. The Documentation at the head needs to
be reviewed. Many flags which are collected here need to be brought back
into the subsystems which use them, this is only to get a big picture for
now.
