New VA108xx Rust workspace structure + dependency updates

- The workspace is now a monorepo without submodules. The HAL, PAC and BSP
  are integrated directly
- Update all dependencies: embedded-hal v1 and RTIC v2

va108xx/README.md

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+[![Crates.io](https://img.shields.io/crates/v/va108xx)](https://crates.io/crates/va108xx)
+[![build](https://github.com/us-irs/va108xx-rs/actions/workflows/ci.yml/badge.svg)](https://github.com/us-irs/va108xx-rs/actions/workflows/ci.yml)
+[![docs.rs](https://img.shields.io/docsrs/va108xx)](https://docs.rs/va108xx)
+
+# PAC for the Vorago VA108xx microcontroller family
+
+This repository contains the Peripheral Access Crate (PAC) for
+Voragos VA108xx series of Cortex-M0 based microcontrollers.
+
+The crate was generated using [`svd2rust`](https://github.com/rust-embedded/svd2rust).
+
+If you are interested in higher-level abstractions, it is recommended you visit
+the [`va108xx-hal` HAL crate](https://egit.irs.uni-stuttgart.de/rust/va108xx-hal) and
+the [`vorago-reb1` BSP crate](https://github.com/robamu-org/vorago-reb1-rs) which build on top of
+this PAC and provide application examples as well.
+
+## Usage
+
+To use this crate, add this to your `Cargo.toml`
+
+```toml
+[dependencies.va108xx]
+version = "<Most Recent Version>"
+features = ["rt"]
+```
+
+The `rt` feature is optional and recommended. It brings in support for `cortex-m-rt`.
+
+For full details on the autgenerated API, please see the
+[svd2rust documentation](https://docs.rs/svd2rust/0.19.0/svd2rust/#peripheral-api).
+
+## Regenerating the PAC
+
+If you want to re-generate the PAC, for example if the register file `va416xx.svd` changes
+or the `svd2rust` version is updated, you can do some using the following these steps:
+
+1. Make sure all necessary tools are installed: [`svd2rust`](https://docs.rs/svd2rust/latest/svd2rust/),
+   [`svdtools`](https://github.com/rust-embedded/svdtools) and [`form`](https://crates.io/crates/form).
+   You can install all tools with `cargo`:
+
+   ```sh
+   cargo install --locked svd2rust svdtools form
+   ```
+
+2. Patch the vendor-provided SVD file `svd/va41xx.svd`. This can be done using `svdtools` in
+   conjunction with the `svd/va108xx-patch.yml` file.
+
+   ```sh
+   svdtools patch svd/va108xx-patch.yml
+   ```
+
+3. Use `svd2rust` to generate the Rust library
+
+   ```sh
+   svd2rust -i svd/va108xx.svd.patched
+   ```
+
+4. Use the `form` tool to split the generated `lib.rs` into individual modules.
+
+    ```sh
+    form -i lib.rs -o src/
+    ```
+
+The `gen-helper.sh` automates steps 2-4.