Updated v3_1 changelog

doc/release/v3_1.md

@@ -7,23 +7,53 @@ This is the first release for which a changelog was introduced.
 - The toolbox style is now defined by a [`.clang-format`](https://github.com/robotology/wb-toolbox/.clang-format) file.
   PRs must be compliant to this style in order to be merged.
 - The `master` branch is protected. Only repo admins can directly push to `master` (even if this is discouraged).
+- CMake 3.5 is now required.
+- The toolbox is now split in three components: `WBToolboxLibrary`, `WBToolboxMex`, `WBToolboxCoder`.
+- Doxygen documentation greatly improved.
 
 ## New Features
 
+- First version that support Simulink Coder for generating C++ code from a model.
+- Most of the classes now use the pimpl idiom.
+- Headers have been cleaned with IWYU.
+
 ### `WBToolboxLibrary`
 
+- `BlockInformation` interface has been polished. Now it uses enums and const arguments.
+- Implemented new logic for parsing parameters. Added `ConvertStdVector` helper and `Parameter` `Parameters` classes.
+- `Log` switched to a `stringstream` implementation, and the verbosity automatically changes between `Debug` and `Release`.
+- All the templates have been moved in the `cpp` file, and the allowed instantiations are now explicitly specialized or declared in the header.
+- Improved the logic to compute the number of block's parameters.
+- Changed many enums names and their scope for improving readability. Switched to `enum class`.
+- Improved checks on Signal validity before their usage in all blocks.
+
 ### `WBToolboxMex`
 
+- The S-Function was renames from `toolbox.cpp` to `WB-Toolbox.cpp`.
+- Now also the `BlockInformation` object is stored in the PWork instead of being created every time.
+- Checks on pointers gathered from the PWork have been improved.
+
 ### `WBToolboxCoder`
 
+- First version of `CoderBlockInformation` class.
+- First version of `WBToolbox.tlc` file for inlining the S-Function.
+- First version of the C++ wrapper for executing the class autogenerated by Simulink Coder.
+
 ## Bug Fixes
 
 ### `WBToolboxLibrary`
 
+- Fixed wrong handling of `Signal::setBuffer` in the `DataFormat::CONTIGUOUS_ZEROCOPY` case. The memory of the previous buffer, which is not owned by the class, was zeroed and new data was copied on top of it.
+
 ### `WBToolboxMex`
 
 ### `WBToolboxCoder`
 
+## Other
+
+- `MxAnyType` is now a shared library.
+- All files now include the license header.
+
 ## Contributors
 
 This is a list of people that contributed to this release (generated from the git history using `git shortlog -ens --no-merges v3.0..v3.1`):