Allow to change position/alignment of the notification

[jirutka]

Currently, the notification box is displayed at the center of the screen. I’d like to place it horizontally at e.g. 1/3 of the screen height from the bottom. Unfortunately, I’m not familiar with GTK and cannot figure out how to do that.

@misterdanb, can you please consider this feature or give me some hints how to proceed with implementing this feature?