Bugfix/fix no dem exception

Merged Daniel Scheffler requested to merge bugfix/fix_no_dem_exception into master
  • Fixed issue #37 (closed) (Empty FileNotFoundError in case no DEM is provided by the user). If no DEM is provided by the user, an average elevation (default=0) is used instead. Added corresponding warning and log messages.
  • Fixed exception in case an average elevation is passed.
  • Fixed a bug that caused 0 or 1 integers provided in the config parameters to be converted to booleans.
  • User-provided file paths are now validated directly on startup.
  • DEM_Processor instance can now be created from an average elevation (returns a flat DEM).
  • RPC geolayer generators are now also compatible with an integer as input elevation.

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