FileAnalysis: refactor add/remove/stop BIFs, add BOF triggers/fields.

The add_action, remove_action, and stop BIFs now go through a queue to
ensure that modifications are made at well-defined times and don't end
up invalidating loop iterators.

src/file_analysis/Action.h

@@ -39,7 +39,9 @@ public:
 		{ return true; }
 
 	/**
-	 * Subclasses may override this to specifically handle the end of a file.
+	 * Subclasses may override this to specifically handle an EOF signal,
+	 * which means no more data is going to be incoming and the action/analyzer
+	 * may be deleted/cleaned up soon.
 	 * @return true if the action is still in a valid state to continue
 	 *         receiving data/events or false if it's essentially "done".
 	 */
@@ -64,6 +66,11 @@ public:
 	 */
 	RecordVal* Args() const { return args; }
 
+	/**
+	 * @return the file_analysis::Info object to which the action is attached.
+	 */
+	Info* GetInfo() const { return info; }
+
 	/**
 	 * @return the action tag equivalent of the 'act' field from the ActionArgs
 	 *         value \a args.