[INTERNAL] Configuration: Make some experimental options public

To facilitate this change, all public options now are also accepted 
with their 'experimental' name (prefixed with 'xx-').

Example:

  data-sap-ui-bindingSyntax = 'complex'
  
can also be written as

  data-sap-ui-xx-bindingSyntax = 'complex'
  
Change-Id: I3c7e2d2df08629d8d4b2d56184a1e71f167047ca
Merge "[INTERNAL] Configuration: Make some experimental options public"