Feature: Add icon sizes to the layout flyout

[yaira2]

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  Closes #issue...

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[0x5bfa]

LGTM codebase-wise.
It's worth it to make a UserControl for this flyout, instead?

[yaira2]

It's worth it to make a UserControl for this flyout, instead?

Probably, or at least separate the xaml from the toolbar. Would you like to work on this after merging the PR?

[0x5bfa]

Probably, or at least separate the xaml from the toolbar. Would you like to work on this after merging the PR?

Everything is welcome. Yeah.