v0.1.0

Added

• SonarClient for the Sonar 3D-15 HTTP API, with an injectable HttpTransport and a libcurl implementation.
• UdpSocket and Receiver for the multicast or unicast RIP2 stream, dispatching range images, signal-strength images and IMU batches to callbacks on a receive thread.
• rip::Decoder for RIP1 and RIP2 datagrams.
• Conversions from range images to per-pixel distances and organized or unorganized XYZ point clouds, and from signal-strength bitmaps to linear strength.
• sntp_query() for checking an NTP server's clock before configuring it on the sonar.
• CMake package config, colcon package.xml, and example programs.