Refactor and add XpathParser for UI Automation

This commit encompasses a range of enhancements and additions aimed at improving the application's architecture, performance, and code quality. Key changes include:

- Removal of unused `using` directives in `App.xaml.cs` and `MainWindow.xaml.cs`, streamlining the codebase and potentially enhancing compile-time efficiency.
- Introduction of sophisticated threading management to improve UI responsiveness. This includes updates managed on the UI thread and data processing offloaded to a background thread, ensuring the UI remains responsive during intensive operations.
- User experience improvements such as disabling the `BtnTestXpath` button during operations to prevent unpredictable states or performance issues.
- Codebase simplification for better readability and maintenance, including the removal of unused methods, constructors, and the consolidation of UI update logic.
- Addition of a new `XpathParser.cs` file within the `UiaXpathTester` namespace, equipped with functionality to parse XPath strings and convert them into UI Automation conditions.
- Implementation of several private static methods in `XpathParser` for creating UI Automation conditions based on control types, logical operators, and properties, utilizing reflection for dynamic mapping to UI Automation IDs.

These modifications collectively aim to refine the application by enhancing performance, ensuring UI responsiveness, and improving maintainability and code quality.

Author: gravity-api

src/UiaXpathTester/App.xaml.cs

@@ -1,6 +1,4 @@
-using System.Configuration;
-using System.Data;
-using System.Windows;
+using System.Windows;
 
 namespace UiaXpathTester
 {