[Development] New API design for file system operations

[Shawn Rutledge]

> On 8 Feb 2019, at 11:10, Christian Kandeler <Christian.Kandeler at qt.io> wrote:
> 
> On Thu, 7 Feb 2019 16:03:30 +0000
> Volker Hilsheimer <volker.hilsheimer at qt.io> wrote:
> 
>> Thoughts, ideas, and pointers to other frameworks that you believe provide a good API are welcome here in this email thread before moving to a dedicated JIRA ticket. 
> 
> My personal pet peeve: Please, let's never again use the term "file name" when we actually mean a file path.

+1: maybe it’s a good time to fix up the badly named functions at least (we could even start adding new and deprecating old ones soon, not wait for Qt 6).