重构：模块化 RRPP Lite 并更新入口

lite/test/PyQt5/QtCore.py

@@ -0,0 +1,10 @@
+class Qt: pass
+class QTimer: pass
+
+class _Signal:
+    def connect(self, *a, **k): pass
+    def emit(self, *a, **k): pass
+
+def pyqtSignal(*a, **k):
+    return _Signal()
+class QRectF: pass