Add a language.kl module which should contain builtin stuff

compiler.h

@@ -186,7 +186,8 @@ struct Parse_Ctx:Lexer{
   U64 unique_ids; // @Debug
   Map type_map;
 
-  Ast_Module *builtins;
+  Ast_Module *language_base_module;
+
   // Array<Ast_File *> files;
   Array<Ast_Module *> modules;
   Array<Ast_Decl *> ordered_decls;
@@ -251,8 +252,6 @@ parse_init(Parse_Ctx *ctx, Allocator *perm_allocator, Allocator *heap_allocator)
   arena_init(&ctx->stage_arena, "Compiler stage arena"_s);
 
   lex_init(ctx->perm, ctx->heap, ctx);
-  ctx->builtins = ast_module(0, ctx->intern("builtins"_s));
-  insert_builtin_types_into_scope((Ast_Scope *)ctx->builtins);
 
   init_type();
 }