Unite most info tools into just one binary

Turn this into more of an fq alternative, when used with jq.

Also don't say that TIFF files are Exif.

tools/rawinfo.c

@@ -161,7 +161,7 @@ int
 main(int argc, char *argv[])
 {
 	// XXX: Can't use `xargs -P0`, there's a risk of non-atomic writes.
-	// Usage: find . -iname *.png -print0 | xargs -0 ./rawinfo
+	// Usage: find . -print0 | xargs -0 ./rawinfo
 	for (int i = 1; i < argc; i++) {
 		const char *filename = argv[i];