[Issue 16298] New: [ER] lazily register standard codecs from std.encoding

[via Digitalmars-d-bugs]

https://issues.dlang.org/show_bug.cgi?id=16298

          Issue ID: 16298
           Summary: [ER] lazily register standard codecs from std.encoding
           Product: D
           Version: D2
          Hardware: All
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: P1
         Component: phobos
          Assignee: nobody at puremagic.com
          Reporter: ketmar at ketmar.no-ip.org

Created attachment 1604
  --> https://issues.dlang.org/attachment.cgi?id=1604&action=edit
lazily registers standard codecs

the attached patch seems to work ok with my system. it registers standard
codecs when on first call to `EncodingScheme.create()`, and it also exposes
`EncodingScheme.registerStandardCodecs()` function, which can be called to
manually register standard codecs if it is necessary in some other module ctor.

it is safe to call `EncodingScheme.registerStandardCodecs()` multiple times,
and from multiple threads.

this patch solves issue 16291 for the time being, until the proper fix for
cycle detection in module ctors isn't complete.

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