Mac Engine: Got it running with the latest version of Alure.

git-svn-id: svn://svn.code.sf.net/p/opensludge/code@620 27a91dd4-ec73-4ff0-838b-64dfa05f697e

Conflicts:
	Mac Engine/OSXMain.m
	Mac Engine/Sludge Engine.xcodeproj/project.pbxproj
Engine Bugfix: Allow opening an URL with launch().

git-svn-id: svn://svn.code.sf.net/p/opensludge/code@634 27a91dd4-ec73-4ff0-838b-64dfa05f697e