Smsh

* Update file editing to use heredoc. Fixes issues with special characters.

* Use Pythons Logging utility instead of Print to log. Fixes issues where error messages were scrambled throughout command output

* Improved Ephemeral session mode. Reduces the number of API calls and overhead when connecting

* Add exit code support
* Fix bug with command.output
* Fix file redirection
* Fix buffered standard error output
* Improved debug logging
* Improved error handling for invalid instances