* 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* Do not publish internal macros crate as it is re-exported by vulkano itself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
* Add as_arr functions to Features and DeviceExtensions
* make as_arr const
* unit tests for as_arr
* also add test for as_arr on InstanceExtensions
* make return str static
* use IntoIterator instead of as_arr
* Use actual integer bitflags for Vulkan bitflag types
* Fix doc tests
* Fix Fence and Semaphore on Win32 and Fuchsia
* Add macro for bitflags that have a corresponding enum
* Fix bug
