Add support for repo.commit-filter and repo.source-filter

These options can be used to override the default commit- and source-
filter settings per repository.

Signed-off-by: Lars Hjemli <hjemli@gmail.com>

shared.c

@@ -62,6 +62,8 @@ struct cgit_repo *cgit_add_repo(const char *url)
 	ret->module_link = ctx.cfg.module_link;
 	ret->readme = NULL;
 	ret->mtime = -1;
+	ret->commit_filter = ctx.cfg.commit_filter;
+	ret->source_filter = ctx.cfg.source_filter;
 	return ret;
 }