eval: do simplification pass over identifier resolution, shift from parsing stage -> ir generation / typechecking stage; do simplifications over expr tree, eliminate redundant kinds

src/eval/eval.mdesk

@@ -119,9 +119,7 @@ E_ExprKindTable:
   { Call                 Null                0        "("       ","       ")"}
   
   { LeafBytecode         Null                0        ""        ""        "" }
-  { LeafMember           Null                0        ""        ""        "" }
   { LeafStringLiteral    Null                0        ""        ""        "" }
-  { LeafBool             Null                0        ""        ""        "" }
   { LeafU64              Null                0        ""        ""        "" }
   { LeafF64              Null                0        ""        ""        "" }
   { LeafF32              Null                0        ""        ""        "" }