New context function: get_lair_url() (wayscript#19)

* New context function: get_lair_url()

* Add unit tests for env variable functions

* Remove unused import

* Mock dictionary for test__get_env_var()

GEN-1909 new SDK function - set_secret (wayscript#16)

* allow setting a secret via sdk

* fix pymssql import for local testing

Add internal function for WayScript terminal output (wayscript#17)

* Add internal function for wayscript terminal output

* Add freedts-dev to fix build

* Add simple test for _send_terminal_output

Release v 0.2.2

Adds users identification work

Release v 0.2.1

Support automatically refreshing user access token.

Release v 0.2.0

First release of new python wayscript client

Release v 0.2.0rc2

Release v 0.2.0rc1