Added buttons & apply_theme global stylesheet #1
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The GUI was difficult to use with different theme colors due to hard-coded RGB - an accessibility issue due to lack of contrast between background and text (on a Fedora KDE Plasma 6 DE in my case.) Modified to add radio buttons to pick Light Theme or Dark Theme. Did some code cleanup to apply a stylesheet globally based on the radio button selection, rather than having individual stylesheets for widget classes.