Added list comprehensions and standard List, Option, Func, Pair, and Triple library (#105)

* Added standard List library and list comprehensions

Added List library.

Flatmaps WIP

Fixed dependency in flat_map

fcode generation

Updated tests to use custom list lib

Added comprehension test

Added stdlib

sanity

Test

* Extended stdlib for lists. Added error message for redefinition of stdlibx

* Fixed type template

* Improved stdlib

* More functions

* Fixed cyclic includes

* Refixed imports and added few tests

* Added fail test

* Undelete removed type spec

* Remove typo

* Fix iter function

* Fixed typo

* Added if guards and let statements in list comp

* Added more fail tests

* Option stliv

* 2 and 3 tuple stdlib

* Updated stdlib to new syntax. Added recursor and changed all/any functions

* Fixed performance issues. Changed include management

* Fixed hash type

src/aeso_syntax.erl

@@ -92,6 +92,7 @@
      | {proj, ann(), expr(), id()}
      | {tuple, ann(), [expr()]}
      | {list, ann(), [expr()]}
+     | {list_comp, ann(), expr(), [comprehension_exp()]}
      | {typed, ann(), expr(), type()}
      | {record, ann(), [field(expr())]}
      | {record, ann(), expr(), [field(expr())]} %% record update
@@ -104,6 +105,10 @@
      | id() | qid() | con() | qcon()
      | constant().
 
+-type comprehension_exp() :: [{ comprehension_bind, ann(), id(), expr()}
+                             | {comprehension_if, expr()}
+                             | letbind()].
+
 -type arg_expr() :: expr() | {named_arg, ann(), id(), expr()}.
 
 %% When lvalue is a projection this is sugar for accessing fields in nested