Use arbitrary self types (self: Arc<Self>)

[GabrielMajeri]

I noticed one of Vulkano's design troubles was that

Vulkano users are encouraged to manipulate objects through Arcs. However there is no way to add a method pub fn foo(self: Arc) to an object

A recent pull request added this feature. It is currently nightly-only, but it does work. It would be cool to switch Vulkano to use this once it becomes stable. See this Rust playground for an example with Arcs.

I've opened this issue to create a tracking list of what needs to be changed for self: Arc<Self>.

[tomaka]

Great, thanks for the report!