Reload folder mappings after modifying a mapping.

include/controller.h

@@ -57,4 +57,5 @@ public:
 	String json();
 	bool process_message(String m);
 	void queue_command(String cmd);
+	void update_playlist_manager();
 };

include/playlist_manager.h

@@ -9,11 +9,14 @@ private:
 	std::map<String, String> _map;
 	std::map<String, Playlist*> _playlists;
 	std::vector<String> _unmapped_folders;
+	void _check_for_special_chars(String s);
+	void _save_mapping();
 public:
 	PlaylistManager();
 	Playlist* get_playlist_for_id(String id);
 	Playlist* get_playlist_for_folder(String folder);
 	void dump_ids();
+	void scan_files();
 	String json();
 	bool add_mapping(String id, String folder);
 };