shift clang-tidy on over to supressing libraries alone, so we don't accidently overlook enhaced reports

Engine/.clang-tidy

@@ -1,6 +0,0 @@
----
-Checks:            '-*,modernize-use-override'
-WarningsAsErrors:  ''
-HeaderFilterRegex: '(source/).*'
-CheckOptions:
-  - { key: modernize-use-override.IgnoreDestructors,          value: true }

Engine/lib/.clang-tidy

@@ -0,0 +1,5 @@
+---
+Checks:            '-*'
+WarningsAsErrors:  ''
+HeaderFilterRegex: '.*'
+FormatStyle:       'file'