Although the method is marked as thread safe in the docs, if you use a
database plugin it ends up not being thread safe.

Operator = is not thread-safe, but copy constructor looks to be. This
is causing an intermittent crash.

Put libraries into one libs directory under qgroundcontrol. Changed the neccessary files with references to those libraries.

Before removing a database, has to be sure that the variable associated with the database is out of scope