Run clang-format on all files

The main change here is to reorder headers.

src/fish_tests.cpp

@@ -24,18 +24,18 @@
 #include <time.h>
 #include <unistd.h>
 #include <wctype.h>
-#include <cstring>
-#include <cwchar>
-#include <thread>
 
 #include <algorithm>
 #include <array>
 #include <atomic>
 #include <cmath>
+#include <cstring>
+#include <cwchar>
 #include <functional>
 #include <memory>
 #include <set>
 #include <string>
+#include <thread>
 #include <utility>
 #include <vector>