It only does binding a nullptr to sqlite, since we can't write to a
nullptr, nor can we assign nullptr to int/string/float/...

Remove forced debug flag, let cmake add it if we build in debug mode
Add pedantic warning flag

Processing is done by a threadpool (limited to a single thread so far)
This will allow using asynchronous modules one after another
Fixing VLC service cleaup code

This reverts commit dea60559.

This reverts commit 47c9bf15.