DeviceDefender bugfix

What's Changed

• Fix bug where DeviceDefender accidentally closed file descriptor 0 (aka stdin) by @graebm in #63

Full Changelog: v0.1.1...v0.1.2

Secure Tunneling related updates

Pass http_proxy_options from secure_tunnel to websocket_options

Add const to aws_socket_options and aws_http_proxy_options in aws_secure_tunnel_options

Secure Tunneling tests properly categorized

v0.1.0

switched secure_tunneling tests to be net tests (#61)

HTTP Proxy Support for Secure Tunneling

• HTTP Proxy Support for Secure Tunneling
• Fix memory ownership issues

Crash fix on deleted defender task

Fixes a crash on mqtt connection completion callbacks invoked during connection destruction

Custom metrics integration

• Added custom metrics (#48)
• Changed interface for DeviceDefender configuration and task resource management and lifecycle

Test compile error fixes

• Fixes a signature mismatch between a test and a private mqtt API

New managed thread API

Convert to new managed thread system for threads that cannot be reliably explicitly joined.

Adapt to aws-c-mqtt API change

v0.0.4

Adapt to API changes in aws-c-mqtt (#49)

More symbol tweaking

• additional fixes for problems that did not show up until doing piecewise .so builds