Major 2.0 (#20)

* New 2.0 version + DependencyInjection library

* Updated docs and repo settings (devcontainers, vscode, github, etc.)

* Added tests

* Fixed bugs

* Minor test project refactoring

* Updated projects
- Added symbol packages
- Updated package versions to pre-release

* Updated SECURITY.md

* Added GitHub Actions workflows

.vscode/extensions.json

@@ -0,0 +1,11 @@
+{
+	"recommendations": [
+		"bierner.github-markdown-preview",
+		"github.vscode-github-actions",
+		"GitHub.vscode-pull-request-github",
+		"Gruntfuggly.todo-tree",
+		"ms-dotnettools.csdevkit",
+		"patcx.vscode-nuget-gallery",
+		"saeris.markdown-github-alerts"
+	]
+}