Updated versions to 0.4.0

Update to 0.4.0-alpha.17

* Specified exact versioning for crates within rust-gpu
* Fixed spirv-std referring to an older version of spirv-std-macros

Updated versions to 0.4.0-alpha.16

Version bump to 0.4.0-alpha.15 (EmbarkStudios#920)

Update to 0.4.0-alpha.14 (EmbarkStudios#905)

* Changed version of all unpublished crates to 0.0.0

* New version: v0.4.0-alpha.14

* Fixed versions in deny.toml

Updated metadata for spirv-builder (EmbarkStudios#903)

Release v0.4.0-alpha.12 (EmbarkStudios#719)

Release v0.4.0-alpha.11 (EmbarkStudios#702)

Release v0.4.0-alpha.10 (EmbarkStudios#679)

Release v0.4.0-alpha.9 (EmbarkStudios#646)