* Add spirv-headers and spirv-tools as submodules
* Add simple generator and the generated code needed for compilation
* Add first pass on spirv-tools-sys
* Add first pass on spirv-tools
* Replace invocation of spirv-opt with spirv-tools crate
* Use C++11
* Placate clippy
* Add validation, replacing spirv-val with the spirv-tools crate
* Fix MSVC warning
* Use patched spirv-tools
* Fixup metadata
* Add same compiler flags as "official" build scripts
* Update spirv-tools and generated files
* Fixup
* Add assembler and example
* Use assembler in tests
* Oops, fix macos TARGET_OS
* write -> write_all
* Start splitting spirv-tools into a compiled vs tool feature set
* Checkpointing
* Checkpoint
* Boop
* Get tests to work both with installed and compiled tools
* Cleanup CI config
* Splits steps to clearly show how long each part of a longer (eg test)
step actually takes
* Label all steps
* Explicitly disable submodule checkout
* Rustfmt
* Rename features for consistency and fix clippy warnings
* Split "core" crates from examples
* Add run_clippy bash script
* Add test script
* Remove x flag
* Newline
* Actually print out errors from running val/opt
* Revert drive-by import merging
* Change intro to take the changes this PR has into account
* Actually run tests on Windows
* Fetch only the host target to reduce fetch times
* Add more info when a spirv tool returns a non-zero exit code
* Rustfmt
* Switch tool assembler to use files to see if it fixes windows
* Use files for input and output for now until I can figure out Windows being dumb
* Fix API docs generation
* Compile and use C++ code to check Windows issue
* Return to use installed tools
