GUI-337: IAM Policy Generator - Resource selection

Implements the following for GUI-337:

- Allow specification of instance type, IP address, and availability zone for select actions 
- Only display one statement when an Allow or Deny is selected at the top level of a namespace
- Save last selected tab in Add Policy page (either select template or policy generator)
- Enable removal of allow/deny statements on subsequent clicks of the check/x-mark
- Allow multiple resources per action, with the ability to remove a statement

Notes:
- IP address/range selection needs additional work
- Need to work on enabling zero or more conditions per resource