ENGINES: Unify engine names

This unifies the engine names in MetaEngine::getName() and the
credits. In particular drop "Engine" or "engine" from the names when
it was present and use expanded names in credits when the
MetaEngine uses it (e.g. "Beneath a Steel Sky" instead of "BASS").

engines/agi/detection.cpp

@@ -164,7 +164,7 @@ public:
 	AgiMetaEngine() : AdvancedMetaEngine(detectionParams) {}
 
 	virtual const char *getName() const {
-		return "AGI preAGI + v2 + v3 Engine";
+		return "AGI preAGI + v2 + v3";
 	}
 	virtual const char *getOriginalCopyright() const {
 		return "Sierra AGI Engine (C) Sierra On-Line Software";