[INTERNAL] mvc.JSView: partially revert deprecation of sap.ui.jsview
[INTERNAL] mvc.JSView: partially revert deprecation of sap.ui.jsview

Only for the 'view instance creation' use case, there's a more modern
alternative to sap.ui.jsview. For the 'view definition' use case, the so
far mentioned alternative (JSView.extend), isn't really supported yet.

The deprecation hint has been modified to clarify this.

Change-Id: I46e2fbe73b626ddb8c1aa0f8c52dbf0192867fe3

SAP/openui5,SAP/openui5,SAP/openui5,SAP/openui5