Changed the door open speed to 1.0f, to be closer to the original DF
Added a Logger object with disk logging and fixed bugs preventing Linux builds

Logging:
	* Created Logger
	* Logger now creates/opens a dfunity.log file for appending (a new feature of the FileProxy)
	* Logger pipes to the file and to the dev console
	* Added logging to a few components (some of it temporary debug messages)

Linux:
	* toUpper was being called on pathnames which broke case-sensitive file system support

Config:
	* config.cfg now supports a path=<path> argument, in which you should specify your ARENA2 absolute directory. This allows for standalone (and Linux) builds