[Issue 20977] New: Move phobos to semver

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=20977

          Issue ID: 20977
           Summary: Move phobos to semver
           Product: D
           Version: D2
          Hardware: All
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: P1
         Component: phobos
          Assignee: nobody at puremagic.com
          Reporter: john.michael.hall at gmail.com

As part of the discussion on the forum here:
https://forum.dlang.org/post/mailman.4131.1593034661.31109.digitalmars-d@puremagic.com
there was a discussion that it would be a good thing to move phobos to semver
(semantic versioning). 

Some reasons that motivate this change are:
1) The release schedule for phobos is linked to that of DMD. Improvements in
phobos must wait until a DMD release. 
2) The version of phobos is linked to that of DMD. In other words, it is
difficult to use a new version of the compiler and an old version of phobos. 
3) Improve use of phobos as a dub package
4) Make it easier to change phobos API
5) Reduce risk of breakage

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