promote test-definition concepts from torture to base layer; reorganize tests to be nested in their respective layer; eliminate 't_group', just use containing layer

src/win32/base/win32_base.c

@@ -156,6 +156,16 @@ w32_thread_entry_point(void *ptr)
   return 0;
 }
 
+////////////////////////////////
+//~ rjf: @per_os_impl Debugger Attachment Checking
+
+internal B32
+debugger_is_attached(void)
+{
+  B32 result = IsDebuggerPresent();
+  return result;
+}
+
 ////////////////////////////////
 //~ rjf: @per_os_impl Platform Time Functions