Basic resolving, codegen with packages

compiler.h

@@ -116,6 +116,7 @@ struct Token{
   S32           line;
   U8           *line_begin;
 };
+global Token null_token;
 
 struct Lex_Stream{
   String stream;
@@ -179,7 +180,6 @@ struct Parse_Ctx:Lexer{
   Ast_Package *resolving_package;
   Array<Ast_Decl *> ordered_decls;
 
-  Token empty_token;
   S64 indent;
   String_Builder gen;
 };