[misc] do not rely on obsolete Riostream.h header and deprecate

[ferdymercury]

This Riostream.h header was there 25 years ago then iostream was not yet in the standards.

Use now standard headers, cleaner and more understandable, plus more fine-grained, why should one include three headers when it can just include the needed one.

[guitargeek]

Squash-on-merge would be okay here?

[ferdymercury]

Squash-on-merge would be okay here?

For me, always! :)

[github-actions]

Test Results

    21 files      21 suites   3d 6h 25m 56s ⏱️
 3 851 tests  3 849 ✅ 0 💤  2 ❌
72 055 runs  72 039 ✅ 0 💤 16 ❌

For more details on these failures, see this check.

Results for commit 7fdcacf.

♻️ This comment has been updated with latest results.

[guitargeek]

LGTM!

[jblomer]

Thanks!

[jblomer]

@ferdymercury could you rebase to retrigger the CI? I think the failures are all unrelated but given the many touched files I would still prefer to see more green.

[ferdymercury]

you rebase to retrigger the CI

sure, done!

[ferdymercury]

@guitargeek I see some UTF8 errors in the CI, could it be related to the recent textinput upgrade?
Or maybe it's just a race between both stressgraphics variants writing to same file on disk?

[guitargeek]

Let's see if these are reproducible failures. I've restarted the CI for now.