Night Mode

[spyhunter99]

feature request from stack overflow
http://stackoverflow.com/questions/31194033/night-mode-using-osmdroid/31215472#31215472

We can create a toggleable tile color inversion to support a quasi night mode

[Crazyphil]

In my app, I pre-create the "night mode" map tiles by inversing them in MOBAC (which of course doubles the disk usage). How's performance of doing that in real-time on the device? I'm a bit sceptical, because the map already is rather resource intensive without doing image manipulation.

[spyhunter99]

I didn't notice a difference