Updated project structure and some file names.

Restored `requirements.txt`

Updated `setup.py` to include new repository url and contact details.

Moved the rtsp code from `record` to `stream`.

Updated project structure to make it more readable and developer friendly - moved mixins to the `mixins` package, moved handlers to the `handlers` package.

Moved files not belonging to anything in particular to the `util` package.

Updated `camera` class to also defer login call.

Deleted unused files like `config_handler`.

reolinkapi/mixins/zoom.py

@@ -0,0 +1,59 @@
+from typing import Dict
+
+
+class ZoomAPIMixin:
+    """
+    API for zooming and changing focus.
+    Note that the API does not allow zooming/focusing by absolute
+    values rather that changing focus/zoom for a given time.
+    """
+    def _start_operation(self, operation: str, speed: float) -> Dict:
+        data = [{"cmd": "PtzCtrl", "action": 0, "param": {"channel": 0, "op": operation, "speed": speed}}]
+        return self._execute_command('PtzCtrl', data)
+
+    def _stop_zooming_or_focusing(self) -> Dict:
+        """This command stops any ongoing zooming or focusing actions."""
+        data = [{"cmd": "PtzCtrl", "action": 0, "param": {"channel": 0, "op": "Stop"}}]
+        return self._execute_command('PtzCtrl', data)
+
+    def start_zooming_in(self, speed: float = 60) -> Dict:
+        """
+        The camera zooms in until self.stop_zooming() is called.
+        :return: response json
+        """
+        return self._start_operation('ZoomInc', speed=speed)
+
+    def start_zooming_out(self, speed: float = 60) -> Dict:
+        """
+        The camera zooms out until self.stop_zooming() is called.
+        :return: response json
+        """
+        return self._start_operation('ZoomDec', speed=speed)
+
+    def stop_zooming(self) -> Dict:
+        """
+        Stop zooming.
+        :return: response json
+        """
+        return self._stop_zooming_or_focusing()
+
+    def start_focusing_in(self, speed: float = 32) -> Dict:
+        """
+        The camera focuses in until self.stop_focusing() is called.
+        :return: response json
+        """
+        return self._start_operation('FocusInc', speed=speed)
+
+    def start_focusing_out(self, speed: float = 32) -> Dict:
+        """
+        The camera focuses out until self.stop_focusing() is called.
+        :return: response json
+        """
+        return self._start_operation('FocusDec', speed=speed)
+
+    def stop_focusing(self) -> Dict:
+        """
+        Stop focusing.
+        :return: response json
+        """
+        return self._stop_zooming_or_focusing()