Drop old style type tests

[richcarl]

The "old style" type tests such as integer(N) (instead of the newer is_integer(N)) have been deprecated for a very long time. I think that they should be dropped from the language.

[github-actions]

CT Test Results

  2 files   11 suites   4m 5s ⏱️
 93 tests  91 ✅ 2 💤 0 ❌
109 runs  107 ✅ 2 💤 0 ❌

Results for commit a15da07.

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[bjorng]

I am pretty sure that not everyone in the OTP team thinks that we should remove old language features.

What we perhaps could do is to make it an error to use them by default. Then there could be a nowarn_ancient option to turn off the warnings for all ancient but not recommended language features. That option could also apply to your other suggested removals.

[richcarl]

That can of course be done, but it won't reduce the maintenance burden (even if it is small in some cases, it can be big in others). Like Joe used to say: if you add things to a language, you should also remove things now and then.