Add stack trace, fix tracking for expandable arenas

lib/Base/ErrorType.cpp

@@ -82,8 +82,6 @@ void log_error_internal (string file_path, string function_name, s32 line_number
   Assert(tctx != nullptr);
   push_arena(tctx->error_arena);
   
-  // Why don't we use thread_context->log_builder here??
-  // String_Builder* sb = new_string_builder(Arena_Reserve::Size_64K);
   String_Builder* sb = thread_context()->log_builder;
 
   print_to_builder(sb, "%s ", error_severity(severity));
@@ -95,7 +93,6 @@ void log_error_internal (string file_path, string function_name, s32 line_number
   
   append(sb, "\n");
   
-  // string error_string = builder_to_string(sb);
   string error_string = copy_string(string_view(sb));
   
   reset_string_builder(sb);

src/Ex1.cpp

@@ -336,7 +336,8 @@ void ImGui_Debug_Panel () { using namespace ImGui;
   }*/
 #if BUILD_DEBUG
   SeparatorText("Default Allocator Allocations");
-  { auto allocations = to_view(get_general_allocator_data()->allocations);
+  { lock_guard(&allocator_mutex);
+    auto allocations = to_view(get_general_allocator_data()->allocations);
     Text("%s in %lld allocations", 
       format_bytes(get_general_allocator_data()->total_bytes_allocated).data,
       allocations.count);