Updated documentation and changelog

CHANGELOG.md

@@ -1,5 +1,9 @@
 ## Latest
 
+  * Fixed a bug where `get_traffic_light` would always return `None`
+  * Changed frozen behavior for traffic lights. It now affects to all traffic lights at the same time
+  * Added API function `freeze_all_traffic_lights` and `reset_group`
+  * Fixed recorder determinism problems
   * Added Light ids
   * Added vehicle light and street light data to recorder
   * Added API function `add_angular_impulse()` to add angular impulse to any actor

Docs/python_api.md

@@ -1720,12 +1720,16 @@ Current state of the traffic light.
 
 <h3>Methods</h3>
 - <a name="carla.TrafficLight.freeze"></a>**<font color="#7fb800">freeze</font>**(<font color="#00a6ed">**self**</font>, <font color="#00a6ed">**freeze**</font>)  
-Stops the traffic light at its current state.  
+Stops all the traffic lights in the scene at their current state.  
     - **Parameters:**
         - `freeze` (_bool_)  
 - <a name="carla.TrafficLight.is_frozen"></a>**<font color="#7fb800">is_frozen</font>**(<font color="#00a6ed">**self**</font>)  
 The client returns <b>True</b> if a traffic light is frozen according to last tick. The method does not call the simulator.  
     - **Return:** _bool_  
+- <a name="carla.TrafficLight.reset_group"></a>**<font color="#7fb800">reset_group</font>**(<font color="#00a6ed">**self**</font>)  
+Resets the state of the traffic lights of the group to the initial state at the start of the simulation.  
+    - **Note:** <font color="#8E8E8E">_This function calls the simulator.
+_</font>  
 
 <h5 style="margin-top: -20px">Getters</h5>
 <div style="padding-left:30px;margin-top:-25px"></div>- <a name="carla.TrafficLight.get_elapsed_time"></a>**<font color="#7fb800">get_elapsed_time</font>**(<font color="#00a6ed">**self**</font>)  
@@ -2500,6 +2504,10 @@ Same as **<font color="#7fb800">spawn_actor()</font>** but returns <b>None</b> o
         - `attach_to` (_[carla.Actor](#carla.Actor)_) – The parent object that the spawned actor will follow around.  
         - `attachment` (_[carla.AttachmentType](#carla.AttachmentType)_) – Determines how fixed and rigorous should be the changes in position according to its parent object.  
     - **Return:** _[carla.Actor](#carla.Actor)_  
+- <a name="carla.World.freeze_all_traffic_lights"></a>**<font color="#7fb800">freeze_all_traffic_lights</font>**(<font color="#00a6ed">**self**</font>, <font color="#00a6ed">**frozen**</font>)  
+Freezes or unfreezes all traffic lights in the scene. Frozen traffic lights can be modified by the user but the time will not update them until unfrozen.  
+    - **Parameters:**
+        - `frozen` (_bool_)  
 
 <h5 style="margin-top: -20px">Getters</h5>
 <div style="padding-left:30px;margin-top:-25px"></div>- <a name="carla.World.get_actor"></a>**<font color="#7fb800">get_actor</font>**(<font color="#00a6ed">**self**</font>, <font color="#00a6ed">**actor_id**</font>)  

PythonAPI/docs/actor.yml

@@ -356,7 +356,7 @@
       - param_name: freeze
         type: bool
       doc: >
-        Stops the traffic light at its current state.
+        Stops all the traffic lights in the scene at their current state.
     # --------------------------------------
     - def_name: is_frozen
       return: bool
@@ -375,6 +375,12 @@
       note: >
         This function calls the simulator.
     # --------------------------------------
+    - def_name: reset_group
+      doc: >
+        Resets the state of the traffic lights of the group to the initial state at the start of the simulation.
+      note: >
+        This function calls the simulator.
+    # --------------------------------------
     - def_name: get_pole_index
       return: int
       doc: >

PythonAPI/docs/world.yml

@@ -318,6 +318,13 @@
       doc: >
         Returns an instance of carla.LightManager that can be used to handle the lights in the scene. 
     # --------------------------------------
+    - def_name: freeze_all_traffic_lights
+      params:
+        - param_name: frozen
+          type: bool
+      doc: >
+        Freezes or unfreezes all traffic lights in the scene. Frozen traffic lights can be modified by the user but the time will not update them until unfrozen. 
+    # --------------------------------------
     - def_name: get_map
       return: carla.Map
       doc: >