get rid of piForeach

apply some code analyzer recommendations
ICU flag now check if libicu exists
prepare for more accurate growth of containers (limited PoT, then constantly increase size)

libs/main/core/piobject.h

@@ -510,7 +510,7 @@ public:
 	//! Returns PIObject* with name "name" or 0, if there is no object found
 	static PIObject * findByName(const PIString & name) {
 		PIMutexLocker _ml(mutexObjects());
-		piForeach(PIObject * i, PIObject::objects()) {
+		for (auto * i: PIObject::objects()) {
 			if (i->name() != name) continue;
 			return i;
 		}