Hebi-py

----------------
* added experimental high-level "Arm API" to enable easier control of robotic arm systems

------------------
* Fix incorrect behavior when getting and setting IO pin values

------------------
* Reduce conversion needs by adding (deprecated) overloads for:

* getJ
* getJacobians
* getFK
* getForwardKinematics
* getFrameCount

* Fix multiple definition error

* Robot Model:

* Added "input frame" type for forward kinematics operations
* Added end effector support (custom and parallel gripper types)
* Added R-series support (actuator, link, bracket, and end effector)
* Added options for link input + output type
* Support import of HRDF format 1.2.0

* Robot Model:

* removed "combine" functionality for addJoint and addRigidBody
* now only allows addition of elements which match the physical interface of the previous element
* changed the behavior of "end effector" frames; by default, none are returned any unless an "end effector" is specifically added
* Changed usages of HebiJointType, HebiFrameType, and HebiRobotModelElementType C-style enums to C++ scoped enums

* Fixed bug when setting IO pins in commands; commands would sometimes affect other pins.

* Added ability to set and clear text in the experimental mobile IO API
* Added ability to get raw feedback from experimental mobile IO API

------------------
* Updated various messages:

* Info:

* Added "serial" getter for Info packets

* Info and Command:

* Added mstop strategy
* Added position limit strategies
* Added velocity limits
* Added effort limits
* Added flag for whether or not accelerometer feedback includes gravity (on supporting devices, namely Mobile IO devices

* Command:

* Added ability to set strings for and clear the "log" text field in the Mobile IO apps

* Feedback:

* Added "pwm command" feedback

* Add "robot element metadata" that allows for introspection of RobotModel objects.
* Import/Export safety parameters from/to a file into/from GroupCommand objects
* Export safety parameters to a file from GroupInfo objects
* Added "experimental" namespace intended for feature-preview items
* Added "mobile io wrapper" to experimental namespace that allows for easier interface with Mobile IO devices
* Update core C API from 1.4.2 to 1.8.0

* Significantly faster Jacobian computation
* Full wildcard lookup supported when creating groups
* Significantly faster trajectory solver implementation
* Added "subaddress" support in lookup, commands, feedback, and logging; allows for simulator support

* Cleaned up code style:

* default destructors and accessibility for deleted copy/move assignment operators
* const on move operators (src/util.hpp)
* made several getters inline

* Added "FunctionCallResult" used when importing safety parameter files to allow error message to be accessed
* Update core C API from 1.4.2 to 1.8.0

* Fixed getters for motor position, ar position, ar orientation, ar quality, and battery level in feedback
* Locale invariant conversion when reading in .xml files, such as gains and HRDF (always expect "1.23" instead of "1,23", regardless of system's locale setting)
* Use Ethernet header instead of message packet content to discover modules on the network (fixes issue when using multiple interfaces - wired and wireless - on iPad or Android running HEBI Mobile I/O)