Implement XDG compliance, logging, and improved 401 error handling

- Install to ~/.local/bin/winamp-mpris
- Use ~/.local/state/winamp-mpris/bridge.log for logging
- Use $XDG_RUNTIME_DIR/winamp-mpris.pid for PID management
- Add detailed user notification for 401 Unauthorized errors
- Add install.sh for automated, standard-compliant setup
- Include Winamp Web Interface source code and installer in repository

Wawi Source/op_winamp.h

@@ -0,0 +1,35 @@
+// op_winamp.cpp
+
+class CControl
+{
+public:
+	int Image(connection * conn,int type);
+	int TopFrame(connection * conn);
+	int SmallTitle(connection * conn);
+	int Title(connection * conn);
+	int Shutdown(connection * conn);
+	int Clear(connection * conn);
+	int Download(connection * conn);
+	int Load(connection * conn);
+	int List(connection * conn);
+	int Next(connection * conn);
+	int Prev(connection * conn);
+	int Play(connection * conn);
+	int Stop(connection * conn);
+	int StopSlow(connection * conn);
+	int Pause(connection * conn);
+	int Volume(connection * conn);
+	int Playmode(connection * conn);
+	int About(connection * conn);
+	int Main(connection * conn);
+	int WebAdmin(connection * conn);
+	int ApplyAdmin(connection * conn);
+	int pda(connection * conn);
+	int Delete(connection * conn);
+	int User(connection * conn);
+	int SetUser(connection * conn);
+	int UserStyle(connection * conn);
+	int Sort(connection * conn);
+	int SavePlaylist(connection * conn);
+	
+};