Add repo.hide and repo.ignore

These options can be used to hide a repository from the index or
completely ignore a repository, respectively. They are particularly
useful when used in combination with scan-path.

Signed-off-by: Lukas Fleischer <cgit@cryptocrack.de>

cgit.h

@@ -106,6 +106,8 @@ struct cgit_repo {
 	struct cgit_filter *email_filter;
 	struct cgit_filter *owner_filter;
 	struct string_list submodules;
+	int hide;
+	int ignore;
 };
 
 typedef void (*repo_config_fn)(struct cgit_repo *repo, const char *name,