Support rmaps sqlite format

Hi Orux,

Firstly thanks for you creating such a great software for many people.
I found that OruxMaps provides many great features and excellent support for importing kml, POIs, tracks, etc.
In fact, I used another app called rmaps before, and I found the sqlite format between rmaps and MBTiles are
very similar and could be supported by current design. So if it's possible to support rmaps sqlite format in OruxMaps as well?

Many Thanks,
winest