[INTERNAL] m.ComboBox: keyboard handling refactoring

Change-Id: I1ec7045bb5b4b69df3944a7d0d9945d05e8a6e39
[FIX] sap.m.UploadCollection: TAB-Navigation corresponds to sap.m.List

Change-Id: I6ce2c7ca797694fc66ed070aec10642a52e9bc06
Merge "[INTERNAL] m.ComboBox: keyboard handling refactoring"
Merge "[FIX] sap.m.UploadCollection: TAB-Navigation corresponds to sap.m.List"