Prepare changelog for next stable release

doc/release/yarp_3_5.md

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+YARP <yarp-3.5> (UNRELEASED)                                         {#yarp_3_5}
+============================
+
+[TOC]
+
+YARP <yarp-3.5> Release Notes
+=============================
+
+
+A (partial) list of bug fixed and issues resolved in this release can be found
+[here](https://github.com/robotology/yarp/issues?q=label%3A%22Fixed+in%3A+YARP+yarp-3.5%22).
+
+
+New Features
+------------
+
+### Libraries
+
+#### `math`
+
+* added method `yarp::math::Quaternion::isValid()`
+* added method `yarp::math::FrameTransform::isValid()`
+
+
+
+### Build System
+
+* Fixed infinite loop when using yarp_add_idl and yarp_idl_to_dir without
+  searching the `idl_tools` component.
+* Fixed build on Ubuntu Bionic when both PCL and OpenNI are enabled
+
+
+### Libraries
+
+#### `os`
+
+##### `Log`
+
+* Fixed custom log components not forwarding the log properly when running under
+  `yarprun`.
+
+##### `ResourceFinder`
+
+* Fixed folder creation in `getHomeContextPath` and `getHomeRobotPath`.
+
+##### `idl::WireReader`
+
+* Fixed reading empty string as latest argument.
+
+
+### `dev`
+
+* Fixed parsing of parameters `hw_gain` and `sw_gain` in the two classes
+  `AudioPlayerDeviceBase` and `AudioRecorderDeviceBase`
+
+* Fixed issue with case insensitive file systems.
+
+* Added methods `startStorageThread()` and `stopStorageThread()` to interface
+ `yarp::dev::IFrameTransformStorageUtils`
+
+
+
+### `robotinterface`
+
+* Fixed `extern-name` for non-string parameters.
+
+### `run`
+
+* Fixed handling of multiple environment variables with `yarprun` on win32
+
+
+### Devices
+
+#### `audioFromFileDevice`
+
+* Fixed module when channels are > 1
+
+#### `controlBoard_nws_yarp`
+
+* Fixed segmentation fault if the device to which the nws attempts to attach was
+  not successfully opened.
+
+### `controlBoard_nws_ros`
+
+* `/joint_states` is no longer appended to the topic name.
+
+#### `controlboardremapper`
+
+* Fixed segmentation fault.
+
+#### `ffmpeg_grabber`
+
+* Fixed symbol lookup runtime error.
+
+#### `ffmpeg_writer`
+
+* Fixed symbol lookup runtime error.
+
+### `frameGrabber_nws_ros`
+
+* The `frame_id` parameter is no longer required to start with `/`.
+
+#### `frameTransformClient`
+
+* Fixed concurrent access to the internal container.
+* Timestamp is now set also for static_transforms
+* Updated xml files according to the changes to the subdevices.
+
+#### `frameTransformServer`
+
+* Updated xml files according to the changes to the subdevices.
+
+#### `frameTransformGet_nwc_yarp`
+
+* Fixed missing callback initialization. Without it, no data was collected from
+  the streaming port.
+
+#### `frameTransformSetMultiplexer`
+
+* fixed race condition issue in `deleteTransform()` method.
+
+#### `frameTransformStorage`
+
+* Fixed race condition issue: added extra mutex to protect the periodicThread
+  from set/get/delete operations
+* the periodic thread can be now stopped/started on request by
+  methods `IFrameTransformStorageUtils::stopStorageThread` and
+  `IFrameTransformStorageUtils::startStorageThread`.
+* Fixed `start` method not called after successfully attaching to a
+  `yarp::dev::IFrameTransformStorageGet` interface.
+  The device is now able to update its `FrameTransformContainer` storage by
+  querying the device it was attached to.
+* Fixed attach function that did not performed the view on the
+  `iFrameTransformStorageGet` interface and did not return `true` when
+  successful.
+
+#### `frameTransformContainer`
+
+* Added new iterator class. It iterates only on valid transforms.
+* when a transform is deleted, it is marked as invalid. The transform is then
+  removed during the next iteration of the `checkAndRemoveExpired()`.
+* Fixed bug in `frameTransformContainer` which was not correctly deleting old
+  transforms.
+
+#### `frameTransformSet_nwc_yarp`
+
+* The device was refactored in order to easily manage ports names.
+
+#### `frameTransformSet_nws_yarp`
+
+* The device was refactored in order to easily manage ports names.
+
+#### `frameTransformGet_nwc_yarp`
+
+* The device was refactored in order to easily manage ports names.
+
+#### `frameTransformGet_nws_yarp`
+
+* The device was refactored in order to easily manage ports names.
+
+#### `frameTransformSet_nwc_ros`
+
+* Fixed bug in `frameTransformSet_nwc_ros::publishFrameTransforms`.
+
+#### `frameTransformSet_nws_ros`
+
+* Fixed time stamps of the static transforms wrongly set to
+ `yarp::os::Time::now()`.
+
+#### `frameTransformGet_nwc_ros`
+
+* Fixed `setStrict` not called for the subscribers ports for the `/tf` and
+  `/tf_static` topics, that was causing a loss of frameTransforms.
+
+#### `map2D_nws_yarp`
+
+* Fixed typos in `Map2D_nws_yarp::parse_vocab_command`.
+
+#### `opencv_grabber`
+
+* Efficiency has been improved as copies are (in most cases) no longer
+  performed in order to convert from OpenCV frames to YARP image structures.
+* Options `--flip_x`, `--flip_y` and `--transpose` are now also available
+  when reading from file (`--movie`).
+
+#### `rgbdSensor_nws_ros`
+
+* Fixed bug in `rgbdSensor_nws::open`. The period was still in milliseconds.
+
+#### `transformClient`
+
+* Fixed method delete in `transformClient`, now avoiding race conditions during
+  server/client update via streaming port.
+
+
+### Port Monitors
+
+#### `image_compression_ffmpeg`
+
+* Fixed symbol lookup runtime error.
+
+
+### GUIs
+
+#### `yarplogger`
+
+* Fixed bug.
+
+#### `yarpmanager`
+
+* Port names containing trailing or leading white spaces not targeted as
+  `non-existing` but throwing an error when trying to connect.
+
+### Bindings
+
+#### Python
+
+* Enable compilation of `libYARP_math` in the Python wheels