Add clang-format file

Also run it across the whole tree to get everything using the One True Style.
We don't yet run this in an automated fashion as it's a little slow, but
there is a snippet to do so in makeall.sh.

Kernel/StdLib.h

@@ -12,12 +12,11 @@ char* strncpy(char*, const char*, size_t);
 int strcmp(char const*, const char*);
 size_t strlen(const char*);
 void* memset(void*, int, size_t);
-char *strdup(const char*);
+char* strdup(const char*);
 int memcmp(const void*, const void*, size_t);
 char* strrchr(const char* str, int ch);
 void* memmove(void* dest, const void* src, size_t n);
 
 inline word ntohs(word w) { return (w & 0xff) << 8 | ((w >> 8) & 0xff); }
 inline word htons(word w) { return (w & 0xff) << 8 | ((w >> 8) & 0xff); }
-
 }