tryTo: non-throwing variant of std.conv.to

[Per Nordlöw]

On Wednesday, 15 August 2018 at 10:38:23 UTC, Jonathan M Davis 
wrote:
>> Would it be sane to add these to std.conv alongside existing 
>> std.conv.to so that underlying logic in std.conv.to can be 
>> reused?
>>
>> If so, AFAICT, existing std.conv.to should be implemented on

Put something together to get early feedback on the idea:

https://github.com/dlang/phobos/pull/6665