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/settings.json

@@ -0,0 +1,13 @@
+{
+	"editor.insertSpaces": false,
+	"editor.rulers": [
+		{
+			"column": 120
+		}
+	],
+	"files.eol": "\n",
+	"files.insertFinalNewline": true,
+	"files.trimFinalNewlines": true,
+	"files.trimTrailingWhitespace": true,
+	"omnisharp.organizeImportsOnFormat": true,
+}