removed xbase stuff from expressions mwe2 

Change-Id: I1ee9d10ec653a0c39b01dc5291772994a33acf6f
generate result var without raw types in aux fun

Change-Id: Icc87b092bdc125d69cd4d25d8ea2808637bdabdb
api-baseline for it.xsemantics.runtime

Change-Id: I86fdb84b96ebeefdf5beb199a8134bbd4585a9a4