lib: introduce WpComponentLoader and remove WpModule

The component loader is a more generic and extensible mechanism
of loading components; modules are one type of component...
The idea is to make scripts and config files also be components,
loaded by plugins that inherit WpComponentLoader

lib/wp/component-loader.h

@@ -0,0 +1,38 @@
+/* WirePlumber
+ *
+ * Copyright © 2021 Collabora Ltd.
+ *    @author George Kiagiadakis <george.kiagiadakis@collabora.com>
+ *
+ * SPDX-License-Identifier: MIT
+ */
+
+#ifndef __WIREPLUMBER_COMPONENT_LOADER_H__
+#define __WIREPLUMBER_COMPONENT_LOADER_H__
+
+#include "plugin.h"
+
+G_BEGIN_DECLS
+
+/**
+ * WP_TYPE_COMPONENT_LOADER:
+ *
+ * The #WpComponentLoader #GType
+ */
+#define WP_TYPE_COMPONENT_LOADER (wp_component_loader_get_type ())
+WP_API
+G_DECLARE_DERIVABLE_TYPE (WpComponentLoader, wp_component_loader,
+                          WP, COMPONENT_LOADER, WpPlugin)
+
+struct _WpComponentLoaderClass
+{
+  WpPluginClass parent_class;
+
+  gboolean (*supports_type) (WpComponentLoader * self, const gchar * type);
+
+  gboolean (*load) (WpComponentLoader * self, const gchar * component,
+      const gchar * type, GVariant * args, GError ** error);
+};
+
+G_END_DECLS
+
+#endif