Handle events in text interpolation; capture text events in choice lines; improve test script

test/tests/function name dispatch.lua

@@ -1,8 +1,8 @@
 local _={}
 _[9]={}
 _[8]={}
-_[7]={data="x",tags=_[9]}
-_[6]={data="a",tags=_[8]}
+_[7]={tags=_[9],text="x"}
+_[6]={tags=_[8],text="a"}
 _[5]={_[7]}
 _[4]={_[6]}
 _[3]={"return"}
@@ -11,12 +11,12 @@ _[1]={"text",_[4]}
 return {_[1],_[2],_[3]}
 --[[
 { "text", { {
-      data = "a",
-      tags = {}
+      tags = {},
+      text = "a"
     } } }
 { "text", { {
-      data = "x",
-      tags = {}
+      tags = {},
+      text = "x"
     } } }
 { "return" }
 ]]--