This PR adds the following functionality to the newt CLI tool:
Generate a per-package "shutdown" function. Allow packages to specify a
function to call when the system shuts down. The syntax is:
```
pkg.down:
<C-function-name>
```The specified function is called when the application requests a shut down. [ Full content available at: https://github.com/apache/mynewt-newt/pull/217 ] This message was relayed via gitbox.apache.org for [email protected]
