This patch updates the results of `mypy --ignore-missing-imports`, run
only against `/pyshacl/cli.py`:

| Count | Type-reviewed state               |
| ----- | --------------------------------- |
|     0 | Current `master` branch state     |
|    40 | Only designating `main() -> None` |
|     0 | Committed state                   |

This patch updates the results of `mypy --ignore-missing-imports`, run
against `/pyshacl`:

| Count | Type-reviewed state                           |
| ----- | --------------------------------------------- |
|    20 | Current `master` branch state                 |
|    61 | Only designating `main() -> None` in `cli.py` |
|    21 | Committed state of `cli.py`                   |
|    20 | Committed state including `main.py`           |

Signed-off-by: Alex Nelson <[email protected]>

This patch also cleans away some typing symbols added when trying to
make the "server mode" `args` variable work, but that became vestigial.

Reported-by: Ashley Sommer <[email protected]>
Signed-off-by: Alex Nelson <[email protected]>