[SettingsControls] Bugfixes and improvements

[niels9001]

This PR introduces the following changes:

1. Fix for focus visual bug for RightAlignedToggleSwitch
Before:

After:

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2. Changing UniformGridLayout to StackLayout
This resolves issues where the content is not always rendered correctly. We were using UniformGridLayout to resolve the expanding bug, but in the end that wasn't working either. StackLayout would be the preferred way to do this anyways.

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3. Updating the SettingsExpander content MinHeight
By default, the Expander.Content MinHeight is enherited from the Header. This resulted, in some cases, that a gap was visible when a SettingsCard would have a lower MinHeight. It's now set to 16 and is overrideable.(SettingsExpanderContentMinHeight)

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4. Fixing a visual glitch whenever Content is null
If the content is null, the contentPresenter was still visible. There's a 8px TopMargin used to show a gap.. but that doesn't make sense when Content is null.

Before:

After:

5. Other fixes

• Removing unused StyledContentPresenter
• Reordered some visual states
• Removing the multiple BoolOptions to avoid the SettingsExpander sample of crashing, until Multiple ToolkitBoolOptions causes crash Tooling-Windows-Submodule#20 gets resolved.

[Arlodotexe]

A suggestion, looks good otherwise.

[michael-hawker]

Couple of small comments/questions, otherwise should be good. After get those answers, can either make changes or merge as needed.