Alphabetical order in monitored folder

[alfablac]

I have explored various methods to ensure files added to the ngPost monitored folder are processed in alphabetical order.

Specifically, when other posts are in progress, ngPost appears to introduce a delay before adding new files. It seems the Qt event responsible for detecting added files does not automatically sort them, resulting in a non-deterministic processing order.

I'm a little rusty with C++, so I was hoping someone could review this code, as mbruel seems MIA.