Plugin needs to send 'version' with each API call, regardless of end-point

[aguywithanidea]

In trying to end-of-life very old versions of the plugin, a gap has been identified in that the plugin does not always send it's version number along to the API when making a request. Some of the requests do; some don't.

TODO: Each and every call to the API should include it's version number in a way that is appropriate for that endpoint schema.

[aguywithanidea]

Currently, only the submissions/list and submissions/show calls send the version.

[aguywithanidea]

For the JSON endpoints this will be added in the headers, as:

Accept: application/vnd.xm.device+json;version=1.5.0

where VERSION is the plugin version

For the XML endpoints this will be added to the publisher section of the request, like:

<request>
    <account>
        <oid>{{user_oid}}</oid>
    </account>
    <publisher>
        <oid>{{publisher_oid}}</oid>
        <version>1.5.0</version>
    </publisher>
</request>

[aguywithanidea]

deployed