Add a `./bin/aphlict build` workflow.

Summary:
Currently, it is a bit tricky to build the Aphlict client SWF from the ActionScript source. Provide a `./bin/aphlict build` workflow that simplifies this process.

Depends on D9226.

Test Plan:
Executed the workflow:

```
> ./bin/aphlict build
Done.
```

Reviewers: #blessed_reviewers, epriestley

Reviewed By: #blessed_reviewers, epriestley

Subscribers: epriestley, Korvin

Differential Revision: https://secure.phabricator.com/D9338