Renaming and preparing to remove oracles (#985)

A few references to oracles still remain, but they have been removed as a feature, at least.

Reviewed-on: #985
Reviewed-by: Ulf Wiger <ulfwiger@qpq.swiss>
Co-authored-by: Craig Everett <zxq9@zxq9.com>
Co-committed-by: Craig Everett <zxq9@zxq9.com>

src/so_ast.erl

@@ -0,0 +1,28 @@
+-module(so_ast).
+-vsn("9.0.0").
+
+-export([int/2,
+         line/1,
+         pp/1,
+         pp_typed/1,
+         symbol/2,
+         symbol_name/1
+        ]).
+
+
+symbol(Line, Chars) -> {symbol, Line, Chars}.
+int(Line, Int) -> {'Int', Line, Int}.
+
+line({symbol, Line, _}) -> Line.
+
+symbol_name({symbol, _, Name}) -> Name.
+
+pp(Ast) ->
+    String = prettypr:format(so_pretty:decls(Ast, [])),
+    io:format("Ast:\n~s\n", [String]).
+
+pp_typed(TypedAst) ->
+    %% io:format("Typed tree:\n~p\n",[TypedAst]),
+    String = prettypr:format(so_pretty:decls(TypedAst, [show_generated])),
+    io:format("Type ast:\n~s\n",[String]).
+