strvec: rename files from argv-array to strvec

This requires updating #include lines across the code-base, but that's
all fairly mechanical, and was done with:

  git ls-files '*.c' '*.h' |
  xargs perl -i -pe 's/argv-array.h/strvec.h/'

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
diff --git a/ref-filter.c b/ref-filter.c
index 8447cb0..81c4399 100644
--- a/ref-filter.c
+++ b/ref-filter.c
@@ -22,7 +22,7 @@
 #include "commit-reach.h"
 #include "worktree.h"
 #include "hashmap.h"
-#include "argv-array.h"
+#include "strvec.h"
 
 static struct ref_msg {
 	const char *gone;