Set T1 as default encoding if \DocumentMetadata is used

[u-fischer]

This changes to T1 as default if \DocumentMetadata is used. As can seen by the various testfile update it changes metrics (in own case e.g. an overfull box disappeared).

Internal housekeeping

Status of pull request

• Ready to merge

Checklist of required changes before merge will be approved

• [ ] Test file(s) added (enough existing test files changed ...
• [x] Version and date string updated in changed source files
• [ ] Relevant \changes entries in source included
• [x ] Relevant changes.txt updated
• [ ] Rollback provided (if necessary)?
• [x] ltnewsX.tex (and/or latexchanges.tex) updated

[car222222]

There are, of course, some remaining small improvements needed to the details of the grammar, etc. But these (and maybe some of the ideas already posted) can wait until a later review of ltnews40.