Rename PropertyGet to more generic Invocator

[softworkz]

...as it's no longer used for property operations only.

[Copilot]

Pull Request Overview

This PR refactors the codebase to rename PropertyGetter to the more generic Invocator, reflecting that this component is no longer used exclusively for property operations. The changes update the base API class and propagate through multiple API files.

Key Changes

• Renamed PropertyGetter class to Invocator in ApiBase.cs
• Renamed GetPropertyAsync<T>() method to InvokeAsync<T>()
• Updated all API classes to use this.InvokeAsync<T>() instead of GetPropertyAsync<T>()

Reviewed Changes

Copilot reviewed 11 out of 11 changed files in this pull request and generated 6 comments.

Show a summary per file

File	Description
src/ElectronNET.API/API/ApiBase.cs	Core refactoring - renamed base class, methods, fields, and constants from PropertyGetter to Invocator terminology
src/ElectronNET.API/API/WebContents.cs	Updated method calls to use InvokeAsync instead of GetPropertyAsync
src/ElectronNET.API/API/Screen.cs	Updated method calls to use InvokeAsync instead of GetPropertyAsync
src/ElectronNET.API/API/Process.cs	Updated method calls to use InvokeAsync instead of GetPropertyAsync
src/ElectronNET.API/API/Notification.cs	Updated method calls to use InvokeAsync instead of GetPropertyAsync
src/ElectronNET.API/API/NativeTheme.cs	Updated method calls to use InvokeAsync instead of GetPropertyAsync
src/ElectronNET.API/API/Clipboard.cs	Updated method calls to use InvokeAsync instead of GetPropertyAsync
src/ElectronNET.API/API/BrowserWindow.cs	Updated method calls to use InvokeAsync instead of GetPropertyAsync
src/ElectronNET.API/API/BrowserView.cs	Updated method calls to use InvokeAsync instead of GetPropertyAsync
src/ElectronNET.API/API/AutoUpdater.cs	Updated method calls to use InvokeAsync instead of GetPropertyAsync
src/ElectronNET.API/API/App.cs	Updated method calls to use InvokeAsync instead of GetPropertyAsync

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[FlorianRappl]

LGTM!