Use a C++ contructor and destructor for CSYNC

Use a C++ contructor and destructor for CSYNC

Merge csync_create and csync_init into the constructor and
replace csync_destroy with the destructor.

Also use a QByteArray for csync_s::root_perms and flatten
csync_rename_s as a rename sub-struct of csync_s since it
can now handle C++ types.