Make rt.util.utf publicly available

[Eduard Staniloiu]

On Monday, 3 December 2018 at 12:56:01 UTC, John Colvin wrote:
> On Monday, 3 December 2018 at 10:50:07 UTC, bauss wrote:
>> On Monday, 3 December 2018 at 10:40:03 UTC, Eduard Staniloiu 
>> wrote:
>>> [...]
>>
>> I think the reason behind the duplications is that the runtime 
>> shouldn't be dependent on Phobos and Phobos shouldn't be 
>> dependent on the runtime.
>>
>> At least if I remember correctly about other duplications 
>> existing.
>
> Phobos definitely depends on druntime, druntime definitely 
> doesn't depend on Phobos

This is also my reasoning on the matter.