Detect actual DF version

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Implement code which detects version number and steam/non-steam. Show it next to the message "this DF version is not supported" (for more clear problem reports from users).

Reference python code:

• detecting DF version: https://github.com/dfint/search_offsets/blob/main/search_offsets/detect_df_version.py
• detecting steam api: https://github.com/dfint/search_offsets/blob/main/search_offsets/detect_steam_api.py
  • possibly can be implemented as fulltext search of "SteamAPI_Init" substring in the executable file

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Implemented in 0.5.0