Add a devcontainer for multiplatform development

This change adds a dev container definition for vscode to support a unified development environment across host configurations.

.devcontainer/Dockerfile

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+FROM mcr.microsoft.com/devcontainers/base:jammy
+
+RUN apt update && apt remove -y mawk && apt install -y gcc-arm-none-eabi libftdi1-dev build-essential pkg-config gawk

.devcontainer/devcontainer.json

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+// For format details, see https://aka.ms/devcontainer.json. For config options, see the
+// README at: https://github.com/devcontainers/templates/tree/main/src/ubuntu
+{
+	"name": "Ubuntu",
+	// Or use a Dockerfile or Docker Compose file. More info: https://containers.dev/guide/dockerfile
+	//"image": "mcr.microsoft.com/devcontainers/base:jammy"
+	"build": {
+		"dockerfile": "Dockerfile"
+	}
+
+	// Features to add to the dev container. More info: https://containers.dev/features.
+	// "features": {},
+
+	// Use 'forwardPorts' to make a list of ports inside the container available locally.
+	// "forwardPorts": [],
+
+	// Use 'postCreateCommand' to run commands after the container is created.
+	// "postCreateCommand": "uname -a",
+
+	// Configure tool-specific properties.
+	// "customizations": {},
+
+	// Uncomment to connect as root instead. More info: https://aka.ms/dev-containers-non-root.
+	// "remoteUser": "root"
+}