* Refactor Vertex trait to not rely on ShaderInterfaceEntryType::to_format and instead rely on Format provided by VertexMember trait.

* Add test for impl_vertex macro, remove tuple implementations as they do not implement Pod, minor cleanups to impl_vertex macro.

* #[derive(Vertex)] proc-macro implementation with support for format and name attributes. Tests are implemented for both attributes and inferral matching impl_vertex macro

* Rename num_elements into num_locations to make purpose clear, add helper function to calculate num_components and check them properly in BufferDefinition's VertexDefinition implementation.

* Rename num_locations back to num_elements to make distinction to locations clear. Updated VertexDefinition implementation for BuffersDefinition to support double precision formats exceeding a single location.

* Add additional validation for vertex attributes with formats exceeding their location.

* Collect unnecessary, using iterator in loop to avoid unnecessary allocations.

* Use field type directly and avoid any form of unsafe blocks.

* Match shader scalar type directly in GraphicsPipelineBuilder

* Rename impl_vertex test to fit macro name

* Add VertexMember implementatinos for nalgebra and cgmath (incl matrices).

* Add missing copyright headers to new files in proc macro crate

* Document derive vertex with field-attribute options on the Vertex trait

* Add example for vertex derive approach.

* Do not publish internal macros crate as it is re-exported by vulkano itself

* Deprecate impl_vertex and VertexMember and update documentation for Vertex accordingly

* Make format field-level attribute mandatory for derive vertex

* Update all examples to derive Vertex trait instead of impl_vertex macro

* Fix doctests by adding missing imports and re-exporting crate self as vulkano to workaround limitations of distinguishing doctests in proc-macros