Editing access within submission workflow stages

[ctgraham]

The "Edit with Texture" link formulates with a stageId:

texture/TexturePlugin.inc.php

Lines 121 to 127 in 8a0b0bb

	$dispatcher->url($request, ROUTE_PAGE, null, 'texture', 'editor', null,
	array(
	'submissionId' => $submissionFile->getSubmissionId(),
	'fileId' => $submissionFile->getFileId(),
	'stageId' => $stageId
	)
	)

This is, presumably, the workflow stage, given that it generally sources from the fetch-grid call for a files grid, e.g. ojs/index.php/test/$$$call$$$/grid/files/production-ready/production-ready-files-grid/fetch-grid?submissionId=3&stageId=5&_=1570819236851

It fails to be assigned any value in a new submission as soon as the wizard moves beyond the initial upload.

Steps to reproduce:

1. As author, start a new submission
2. Upload a JATS XML and Dependent Files
3. Finalize the Submission.
4. Return to the Submission (ojs/index.php/test/$$$call$$$/grid/files/submission/author-submission-details-files-grid/fetch-grid?submissionId=1&_=1570820690723)
5. Try to Edit With Texture (fails)

or

3. Do not finalize the Submission
4. Return to the Submission (ojs/index.php/test/$$$call$$$/grid/files/submission/submission-wizard-files-grid/fetch-grid?submissionId=4&_=1570820830259)
5. Try to Edit With Texture (fails)

There is no need to rely on the URI for the workflow stage. We can get it from the submission.

[withanage]

Thanks @ctgraham for the PR. Merged it