core: Add clang-tidy (#8664)

This adds a .clang-tidy file for us.

It's not a strict requirement to be compliant, but I tuned it to be alright.

src/helpers/Format.hpp

@@ -22,7 +22,7 @@ struct SPixelFormat {
 
 typedef Aquamarine::SDRMFormat SDRMFormat;
 
-namespace FormatUtils {
+namespace NFormatUtils {
     SHMFormat           drmToShm(DRMFormat drm);
     DRMFormat           shmToDRM(SHMFormat shm);