A set of file analysis extensions.

- Enable manager to associate analyzers with a MIME type. With that,
  one can now say enable all analyzers for, e.g., "image/gif". This is
  exposed to script-land as

    Files::add_analyzers_for_mime_type(f: fa_file, mtype: string)

  For MIME types identified via libmagic, this happens automatically
  (via the file_new() handler in files/main.bro).

- Extend the analyzer API to better match that of protocol analyzers:

    - Adding unique analyzer IDs so that we can refer to instances
      from script-land.

    - Adding subtypes to Components so that a single analyzer
      implementation can support different types of analyzers
      internally.

    - Add an analyzer method SetTag() that allows to set the tag after
      construction.

    - Adding Init() and Done() methods for consistency with what other
      classes offer.

- Add debug logging to the file_analysis stream.

TODO: test cases missing for the new script-land functionality.

src/file_analysis/Component.cc

@@ -8,13 +8,15 @@
 
 using namespace file_analysis;
 
-Component::Component(const char* arg_name, factory_callback arg_factory)
+Component::Component(const char* arg_name, factory_callback arg_factory, Tag::subtype_t subtype)
 	: plugin::Component(plugin::component::FILE_ANALYZER),
-	  plugin::TaggedComponent<file_analysis::Tag>()
+	  plugin::TaggedComponent<file_analysis::Tag>(subtype)
 	{
 	name = copy_string(arg_name);
 	canon_name = canonify_name(arg_name);
 	factory = arg_factory;
+
+	file_mgr->RegisterComponent(this, "ANALYZER_");
 	}
 
 Component::Component(const Component& other)
@@ -24,6 +26,8 @@ Component::Component(const Component& other)
 	name = copy_string(other.name);
 	canon_name = copy_string(other.canon_name);
 	factory = other.factory;
+
+	// TODO: Do we need the RegisterComponent() call here?
 	}
 
 Component::~Component()