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/parse-options-cb.c b/parse-options-cb.c
index 86cd393..7cba964 100644
--- a/parse-options-cb.c
+++ b/parse-options-cb.c
@@ -4,7 +4,7 @@
 #include "commit.h"
 #include "color.h"
 #include "string-list.h"
-#include "argv-array.h"
+#include "strvec.h"
 #include "oid-array.h"
 
 /*----- some often used options -----*/