Add colour pickers to application

[JohnnyJF10]

Add colour pickers to application and use them in the format tabs and in the brick transition helper.

[JohnnyJF10]

@copilot For AValonia UI, I added Avalonia.Controls.ColorPicker 12.0.1(https://www.nuget.org/packages/Avalonia.Controls.ColorPicker) . For WPF, I copied the required source code files from https://github.com/PropertyTools/PropertyTools/tree/develop/Source/PropertyTools.Wpf/Controls/ColorPicker into the assembly, find the ColorPicker folder here. Include a new button to all format tabs which opens a new dialog window in which the color pickers are shown. User can pick colours there which will then set ColorSource or ColorTarget on the FormatTabViewModel . The new dialog shall contain a Cancel and an OK button. If modifications are required in the WPF version color picker (as it is just copied source code), please correct.

[Copilot]

@copilot For AValonia UI, I added Avalonia.Controls.ColorPicker 12.0.1(https://www.nuget.org/packages/Avalonia.Controls.ColorPicker) . For WPF, I copied the required source code file...

Implemented in commit c89a8fe (cleanup in 9f75e95). Here's what was added:

Color Picker Dialog:

• Avalonia: ColorPickerWindow.axaml – two ColorView pickers (Source + Target) with OK/Cancel buttons, using the Avalonia.Controls.ColorPicker package
• WPF: ColorPickerWindow.xaml – two PropertyTools.Wpf.ColorPickerPanel controls (Source + Target) with OK/Cancel buttons. Created Themes/Generic.xaml to register the panel's default styles via the WPF theme system

Format Tabs (both Avalonia & WPF MainWindow):
A palette icon button was added next to the eyedropper in both the Source and Destination format tabs. Clicking it opens the dialog; on OK, ColorSource and ColorTarget are updated on the respective FormatTabViewModel.

Brick Transition Helper (both Avalonia & WPF BrickTransitionWindow):
A palette icon button was added to the Options tab. ColorSource and ColorTarget properties were added to TransitionViewModelBase so the dialog can read/write them on BrickTransitionViewModel.

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