db: Load filelists

db: Load filelists

To avoid running an extra query for the filelist, we simply have SQLite
concatenate the filelist and we split it again after.

It would have been nicer to use NUL to concatenate the string, but that
is unfortunately difficult in SQLite, so that we use newline and replace
it later so that we can only run memcpy() once instead of once per line.

Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>