Update README and add asset editing features

Revamped `README.md` to reflect the new title "Realm of Aethermoor" and version 2.0, including updated features and installation instructions.

Introduced a "Tools" menu in `Form1.cs` for accessing the Asset Editor and Data Validation tool.

Added `JsonAssetEditorControl.cs` for a user-friendly interface to edit JSON data files, along with `AddNodeDialog.cs` for adding new nodes with validation.

Created `AssetEditorForm.cs` to manage the asset editing workflow, featuring a toolbar for file operations and a status bar for user feedback.

These changes enhance the overall user experience and functionality of the game.

Author: ewdlop