Style: Enforce braces around if blocks and loops

Using clang-tidy's `readability-braces-around-statements`.
https://clang.llvm.org/extra/clang-tidy/checks/readability-braces-around-statements.html

core/os/semaphore.h

@@ -54,8 +54,9 @@ public:
 
 	_ALWAYS_INLINE_ void wait() const {
 		std::unique_lock<decltype(mutex_)> lock(mutex_);
-		while (!count_) // Handle spurious wake-ups.
+		while (!count_) { // Handle spurious wake-ups.
 			condition_.wait(lock);
+		}
 		--count_;
 	}