Deprecate AEVM (#375)

* Deprecate AEVM

* Fix test, changelog

* Restore old rebar

* rebar lock fix

* undo export

Co-authored-by: Gaith Hallak <gaithhallak@gmail.com>

* undo export

Co-authored-by: Gaith Hallak <gaithhallak@gmail.com>

* Solve GH suggestions

* Fix the docs

* update docs

* Remove unused tests

* undo weird change

Co-authored-by: Gaith Hallak <gaithhallak@gmail.com>

test/contracts/code_errors/unapplied_named_arg_builtin.aes

@@ -1,5 +1,4 @@
 contract UnappliedNamedArgBuiltin =
-  // Allowed in FATE, but not AEVM
   stateful entrypoint main_fun(s) =
     let reg = Oracle.register
     reg(signature = s, Contract.address, 100, RelativeTTL(100)) : oracle(int, int)