Add PowerShell script export feature to GUI

Introduced a new "Export as Script" button to generate PowerShell scripts for signing files based on the current GUI configuration.

- Added `buttonExportAsScript` control and its event handler.
- Implemented `buttonExportAsScript_Click` to dynamically generate scripts for Windows Certificate Store, PFX, and Trusted Signing configurations.
- Repositioned `checkBoxValidatePasswordOnSave` and updated its layout.
- Adjusted menu item sizes for consistency.
- Enhanced usability by allowing automation of signing tasks outside the GUI.

Author: michaelmsonne

CHANGELOG.MD

@@ -3,6 +3,7 @@
 ### 🔧 Improvements
 - Persist Trusted Signing options (Code Signing Account Name and Certificate Profile) between sessions
 - Restore last "Files to Sign" list on startup
+- Added support for exporting the tools config for signing to .ps1 script format
 - Add detailed Trusted Signing diagnostics in logs:
   - Log exact SignTool arguments used for the call
   - Log resolved and better check for absolute paths for DLIB and DMDF and the current working directory

src/SignToolGUI/Forms/ChangelogForm.cs

@@ -24,6 +24,7 @@ private void PopulateChangelog()
                                    " Improvements\n" +
                                    " - Persist Trusted Signing options (Code Signing Account Name and Certificate Profile) between sessions\n" +
                                    " - Restore last 'Files to Sign' list on startup\n" +
+                                   " - Added support for exporting the tools config for signing to .ps1 script format\n" +
                                    " - Add detailed Trusted Signing diagnostics in logs:\n" +
                                    "   - Log exact SignTool arguments used for the call\n" +
                                    "   - Log resolved and better check for absolute paths for DLIB and DMDF and the current working directory\n\n" +