This PR adds JSON output to the existing table printer and updates all
actions which use the table printer.

JSON tables are printed out like:

```json
{
  "kind": "moduleList",
  "data": [
    {"module": "/"},
    {"module": "a"},
    {"module": "a.b"}
  ]
}
```

Where:

* `kind` is the kind of data in the table
* `data` contains the table rows matched to the header

Fixes #693

Signed-off-by: bryanl <bryanliles@gmail.com>