[GL] Renamed method getGEOObject to getGeoObject.
[GL] Changed getGeoObject implementation.

Added more checks and error messages.
Reuse existing GeoLib::convertGeoTypeToString.
[GL] Fixed merge mistake in GUI.

Rename getGEOObject to getGeoObject.
[GL] Remove duplicate error messages.
Merge pull request #301 from endJunction/GeoLib_GeoObject

GeoLib GeoObject retrival rewrite.