.list -> .toList

Fix #248.

test/core/list/map.wren

@@ -1,3 +1,3 @@
 var a = [1, 2, 3]
-var b = a.map {|x| x + 1 }.list
+var b = a.map {|x| x + 1 }.toList
 IO.print(b) // expect: [2, 3, 4]

test/core/list/where.wren

@@ -1,6 +1,6 @@
 var a = [1, 2, 3]
-var b = a.where {|x| x > 1 }.list
+var b = a.where {|x| x > 1 }.toList
 IO.print(b) // expect: [2, 3]
 
-var c = a.where {|x| x > 10 }.list
+var c = a.where {|x| x > 10 }.toList
 IO.print(c) // expect: []