Allow hidden paths to be referenced

Using other git repo tools, such as GitLab, have different practices about how to organize CI config files, even GitHub has hidden paths practices, so ignoring a reference inside one of these folder is important, and shouldn't be ignored.

doorstop/core/vcs/base.py

@@ -94,8 +94,8 @@ def paths(self):
                     # Skip ignored paths
                     if self.ignored(relpath):
                         continue
-                    # Skip hidden paths
-                    if os.path.sep + "." in os.path.sep + relpath:
+                    # Skip hidden paths according to settings definition
+                    if not settings.ALLOW_HIDDEN_PATH_REFERENCES:
                         continue
                     self._path_cache.append((path, filename, relpath))
         yield from self._path_cache

doorstop/settings.py

@@ -24,6 +24,9 @@
 PLACEHOLDER = "..."  # placeholder for new item UIDs on export/import
 PLACEHOLDER_COUNT = 1  # number of placeholders to include on export
 
+# VCS Behaviour
+ALLOW_HIDDEN_PATH_REFERENCES=False
+
 # Formatting settings
 MAX_LINE_LENGTH = 79  # line length to trigger multiline on extended attributes