More manifests, base modules and rename from archiver to extractor.

src/auto_archiver/modules/mute_formatter/__manifest__.py

@@ -0,0 +1,9 @@
+m = {
+    "name": "Mute Formatter",
+    "type": ["formatter"],
+    "requires_setup": False,
+    "external_dependencies": {
+    },
+    "description": """ Default formatter.
+    """,
+}

src/auto_archiver/modules/mute_formatter/mute_formatter.py

@@ -0,0 +1,16 @@
+from __future__ import annotations
+from dataclasses import dataclass
+
+from ..core import Metadata, Media
+from . import Formatter
+
+
+@dataclass
+class MuteFormatter(Formatter):
+    name = "mute_formatter"
+
+    def __init__(self, config: dict) -> None:
+        # without this STEP.__init__ is not called
+        super().__init__(config)
+
+    def format(self, item: Metadata) -> Media: return None