[INTERNAL] sap.m.SelectList: tooltip for items is supported

Change-Id: Ia31dec52e2754b179d4ea7e90c83c82bdad9733a
[INTERNAL] sap.m.ComboBox: .getVisibleItems() avoid array holes

Change-Id: Ib437924eba78f9c44e55543c2d4cfc0b32910cae
Merge "[INTERNAL] sap.m.SelectList: tooltip for items is supported"
Merge "[INTERNAL] sap.m.ComboBox: .getVisibleItems() avoid array holes"