Change JATS document creation to a DOM based model

[asmecher]

@ipula and @withanage, this PR replaces #26.

It also adds...

• 7dd456e for Replace HTMLPurifier with a maintained dependency pkp-lib#7916
• d8c40e8 for dc:languages OAI data not properly sourced from submission language metadata pkp-lib#9205
• 603d9f8:
  • Improvements to readability (less use of ->parentNode; placement of attributes first; etc)
  • Resolves Changing the JATS creation to a DOM based model #26 (comment)
  • Resolves Changing the JATS creation to a DOM based model #26 (comment)
  • Resolves Changing the JATS creation to a DOM based model #26 (comment) about htmlspecialchars / escaping
  • Removes "version-neutral" aspects of the code -- this is intended for release with 3.5 only.
  • https://github.com/pkp/jatsTemplate/pull/26/files#diff-11e457ccd0f48a0b36bf17dbf4eb71477dc3b75ddf8b9be8595fea6fe3516fb3R379: meta-value should not be nested in meta-name
  • https://github.com/pkp/jatsTemplate/pull/26/files#diff-11e457ccd0f48a0b36bf17dbf4eb71477dc3b75ddf8b9be8595fea6fe3516fb3R262: $submission->getLocale() should never be null
  • https://github.com/pkp/jatsTemplate/pull/26/files#diff-11e457ccd0f48a0b36bf17dbf4eb71477dc3b75ddf8b9be8595fea6fe3516fb3R327: $ccBadge misplaced
  • https://github.com/pkp/jatsTemplate/pull/26/files#diff-11e457ccd0f48a0b36bf17dbf4eb71477dc3b75ddf8b9be8595fea6fe3516fb3R340: $ccBadge misplaced
  • https://github.com/pkp/jatsTemplate/pull/26/files#diff-11e457ccd0f48a0b36bf17dbf4eb71477dc3b75ddf8b9be8595fea6fe3516fb3R394: appendChild applied to wrong element; sections data not included in DOM
  • https://github.com/pkp/jatsTemplate/pull/26/files#diff-11e457ccd0f48a0b36bf17dbf4eb71477dc3b75ddf8b9be8595fea6fe3516fb3R462: Author ORCiD should not appear here
  • https://github.com/pkp/jatsTemplate/pull/26/files#diff-11e457ccd0f48a0b36bf17dbf4eb71477dc3b75ddf8b9be8595fea6fe3516fb3R347: kwd should not have xml:lang attribute
  • ...and similar.

Some of these are trickier to catch in review than they are while coding! It pays to work on this kind of code progressively -- modify, test, rinse and repeat, with data in your installation that exercises each piece of code you touch. Be careful with copy/paste; I think a number of weird typos came in that way.

[withanage]

Thanks @asmecher for review!

[asmecher]

Sorry 😨 I forgot to add! @ipula and @withanage, thanks for this, it's always bothered me that we've been building XML with string concatenation. It's finicky work and I really appreciate your willingness to rearrange it painfully based on review feedback!