refactor: format all C files under nvim/ #15977

* refactor: format all C files under nvim
* refactor: disable formatting for Vim-owned files:
    * src/nvim/indent_c.c
    * src/nvim/regexp.c
    * src/nvim/regexp_nfa.c
    * src/nvim/testdir/samples/memfile_test.c

src/nvim/types.h

@@ -1,8 +1,8 @@
 #ifndef NVIM_TYPES_H
 #define NVIM_TYPES_H
 
-#include <stdint.h>
 #include <stdbool.h>
+#include <stdint.h>
 
 // dummy to pass an ACL to a function
 typedef void *vim_acl_T;