Embag

What's Changed
* Python: raw_data + easier read_messages interface by liamembark in https://github.com/embarktrucks/embag/pull/50


**Full Changelog**: https://github.com/embarktrucks/embag/compare/0.0.41...0.0.42

What's Changed
* Fix Primitive Array Access by liamembark in https://github.com/embarktrucks/embag/pull/48


**Full Changelog**: https://github.com/embarktrucks/embag/compare/0.0.40...0.0.41

What's Changed
* Access to all pybind exports from root python module (https://github.com/embarktrucks/embag/pull/45)
* Change `dict()` serialization to have `uint8` be the only default blob type, default blob representation to `bytes` not `memoryview` (https://github.com/embarktrucks/embag/pull/44)


**Full Changelog**: https://github.com/embarktrucks/embag/compare/0.0.39...0.0.40

New Features
* Added the primitive_array type, which enables storage of primitive types in one large blob (https://github.com/embarktrucks/embag/pull/34)
* Remove pybind11 dependency from cpp library (https://github.com/embarktrucks/embag/pull/40)
* Add better iterator support on RosValue python interface (https://github.com/embarktrucks/embag/pull/38)
* Return a memoryview for certain (configurable) primitive_array types in dict conversion (https://github.com/embarktrucks/embag/pull/39)
* Add dict method for RosValues (https://github.com/embarktrucks/embag/pull/42)
* Return time objects rather than timestamps through the python interface, and enable customization of the time type in dict conversion ( https://github.com/embarktrucks/embag/pull/41)
* Add utility for accessing the type name of a message within C++ (https://github.com/embarktrucks/embag/pull/43)
* Allows the use of make_unique from standard library in later cpp versions (https://github.com/embarktrucks/embag/pull/30)

Bug Fixes
* Fix .get in python interface (https://github.com/embarktrucks/embag/pull/36)

**Full Changelog**: https://github.com/embarktrucks/embag/compare/0.0.38...0.0.39

Fixes memory leak introduced by 0.0.37 (32) and adds a buffer protocol for array `RosValue`s in python (33).