fix RunwayModule not subscriptable & awacs/troposphere unload causing isinstance inconsistencies

[ITProKyle]

Why This Is Needed

resolves #360 and fixes an unreported bug introduced by #354

What Changed

Changed

• subclasses of RunwayModule are now subscriptable
• SafeHaven is now able to exclude modules from being unloaded

Fixed

• fixed an issue causing module commands to raise "TypeError: object is not subscriptable"
• fixed an issue where troposphere was unable to properly assess types for some objects

[paul-duffy]

There is a new error when running the deploy:

INFO:runway:---- Processing module 'sample-app' for 'dev' in us-east-1 --------------
INFO:runway:Module options: {'environments': {'dev': {'namespace': 'sample-app-dev', 'staticsite_cf_disable': True}, 'prod': {'namespace': 'sample-app-prod'}}, 'options': {'build_output': 'dist/sample-app', 'build_steps': ['npm install', 'npx ng build']}, 'parameters': {'namespace': 'sample-app-dev', 'staticsite_cf_disable': True}, 'name': 'sample-app', 'type': 'static', 'tags': {}, 'child_modules': [], 'class_path': None, 'env_vars': {}, 'path': 'sample-app', 'environment': True}
Traceback (most recent call last):
  File "/Users/pduffy/.local/share/virtualenvs/bugs-awxQH1y6/bin/runway", line 8, in <module>
    sys.exit(main())
  File "/Users/pduffy/.local/share/virtualenvs/bugs-awxQH1y6/lib/python3.7/site-packages/runway/cli.py", line 91, in main
    command_class(cli_arguments).execute()
  File "/Users/pduffy/.local/share/virtualenvs/bugs-awxQH1y6/lib/python3.7/site-packages/runway/commands/modules/deploy.py", line 55, in execute
    self.run(deployments=None, command='deploy')
  File "/Users/pduffy/.local/share/virtualenvs/bugs-awxQH1y6/lib/python3.7/site-packages/runway/commands/modules_command.py", line 386, in run
    self._process_deployments(deployments_to_run, context)
  File "/Users/pduffy/.local/share/virtualenvs/bugs-awxQH1y6/lib/python3.7/site-packages/runway/commands/modules_command.py", line 468, in _process_deployments
    self._execute_deployment(deployment, context, region)
  File "/Users/pduffy/.local/share/virtualenvs/bugs-awxQH1y6/lib/python3.7/site-packages/runway/commands/modules_command.py", line 490, in _execute_deployment
    self._process_modules(deployment, context)
  File "/Users/pduffy/.local/share/virtualenvs/bugs-awxQH1y6/lib/python3.7/site-packages/runway/commands/modules_command.py", line 527, in _process_modules
    self._deploy_module(module, deployment, context)
  File "/Users/pduffy/.local/share/virtualenvs/bugs-awxQH1y6/lib/python3.7/site-packages/runway/commands/modules_command.py", line 613, in _deploy_module
    module_instance[context.command]()
TypeError: 'StaticSite' object is not subscriptable

[ITProKyle]

That is a bug currently on master and was resolved in this commit