Test Environment Build 05-12-2022

[bryancodazen]

This PR contains the following updates:

1. Updates to the way the API get's called - no longer adds trailing slash before the params as that was causing issues in the test environment.
2. Convoy move for own units
3. Destroy unit logic
4. Retreats and disbands (contains some bugs)
5. Support move foreign units
6. Refactored game-api-slice.ts to make it more readable and put the functions into their own files.
7. Redux fetch game messages action