[Issue 18668] New: Implement modPow() for std.bigint

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=18668

          Issue ID: 18668
           Summary: Implement modPow() for std.bigint
           Product: D
           Version: D2
          Hardware: All
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: P1
         Component: phobos
          Assignee: nobody at puremagic.com
          Reporter: jonathan at wilbur.space

Implement a modPow operator for std.bigint. For comparison, see modPow in
BigInteger.js.

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