xo-reader2 stack: expand symbol table to store typedefs

+ typedef utest
+ misc qol policy choices

src/reader2/DExpectQArraySsm.cpp

@@ -92,6 +92,7 @@ namespace xo {
             case tokentype::tk_comma:
             case tokentype::tk_lambda:
             case tokentype::tk_def:
+            case tokentype::tk_deftype:
             case tokentype::tk_if:
             case tokentype::tk_symbol:
             case tokentype::tk_colon: