Don't parse yaml files with unknown name patterns.

Modified the code to parse the Yaml files as late as possible. But, that meant some files might get parsed multiple times, so I'm also storing the last parsed parsed yaml.

Let's see if this works.

+++ b/potx.inc
@@ -2072,29 +2072,23 @@ function _potx_parse_yaml_file($code, $file_name, $file_path, $save_callback) {
-  try {
-    $yaml = Yaml::parse($code);
-
...
+      $yaml = _potx_get_parsed_yaml($file_name, $code);
...
+    $yaml = _potx_get_parsed_yaml($file_name, $code);

@@ -2103,6 +2097,11 @@ function _potx_parse_yaml_file($code, $file_name, $file_path, $save_callback) {
+    $yaml = _potx_get_parsed_yaml($file_name, $code);

This part does that. _potx_parse_yaml_file() is called for any yaml files we see. But it used to parse the yaml files early on, before checking its name pattern. Now, we only parse it (inside the ifs) when we are sure that it has one of the known file name patterns.