Get rid of clib in big int, introduce message api, add stringify message

core_compiler.h

@@ -40,6 +40,7 @@ struct Core_Ctx{
 
   Scratch_Arena *scratch;
   Scratch_Arena *stage_arena;
+  String_Builder helper_builder;
 
   int errors_occured;
   int warnings_occured;
@@ -78,8 +79,6 @@ struct Core_Ctx{
   String working_folder;
   List<Token *> files_to_link;
 
-  String_Builder helper_builder;
-
   F64 generating_time_begin;
   F64 generating_time_end;
   F64 resolving_time_begin;
@@ -91,6 +90,7 @@ struct Core_Ctx{
   F64 parsing_time_end;
 
   bool color_codes_enabled;
+  bool debugger_break_on_compiler_error;
 
   // Codegen stage mostly
   S64 indent;