Vendor dependencies for 0.3.0 release

vendor/variadics_please/documentation/debugging.md

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+# Debugging
+
+## Macro Debugging
+
+- Print the final output of a macro using `cargo rustc --profile=check -- -Zunstable-options --pretty=expanded`
+  - Alternatively you could install and use [cargo expand](https://github.com/dtolnay/cargo-expand) which adds syntax highlighting to the terminal output.
+    - Additionally get pager by piping to `less` ( on Unix systems ): `cargo expand --color always | less -R`
+- Print output during macro compilation using `eprintln!("hi");`

vendor/variadics_please/documentation/linters.md

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+# Linters in this Repository
+
+## Code Format Linting with [rustfmt](https://github.com/rust-lang/rustfmt)
+
+Can be automatically validated with [`cargo run -p ci`](../tools/ci) (which also runs other checks). Running this command will actually format the code:
+
+```bash
+cargo fmt --all
+```
+
+## Code Linting with [Clippy](https://github.com/rust-lang/rust-clippy)
+
+Can be automatically run with [`cargo run -p ci`](../tools/ci) (which also runs other checks) or manually with this command:
+
+```bash
+cargo clippy --workspace --all-targets --all-features -- -D warnings
+```
+
+Explanation:
+
+* `-D warnings`: No warnings are allowed in the codebase.
+
+## [super-linter](https://github.com/github/super-linter)
+
+`super-linter` provides easy access to many different Linters.
+
+### [markdownlint](https://github.com/DavidAnson/markdownlint)
+
+`markdownlint` is provided by `super-linter` and is responsible for `.md` files.
+Its configuration is saved in the [.markdown-lint.yml](../.github/linters/.markdown-lint.yml) file.
+
+The provided rules are documented [here](https://github.com/DavidAnson/markdownlint/blob/main/doc/Rules.md) and information about setting the config can be seen [here](https://github.com/DavidAnson/markdownlint#optionsconfig).
+
+#### Using [VS Code markdownlint](https://marketplace.visualstudio.com/items?itemName=DavidAnson.vscode-markdownlint)
+
+If you want to use the VS Code Extension with the rules defined in [.markdown-lint.yml](../.github/linters/.markdown-lint.yml), then you need to create a local config file in the root of the project with the configuration below.
+Currently, this is not needed as the extension already disables the rule `MD013` by default.
+
+```json
+{
+  "extends": ".github/linters/.markdown-lint.yml"
+}
+```
+
+### Other Linters provided by [super-linter](https://github.com/github/super-linter)
+
+All other linters not mentioned in the this file are not activated and can be seen [here](https://github.com/github/super-linter#supported-linters).