Version 0.5.0

• Breaking/Fix: <support-slide> extends <img-slide> when slide.caniuse is present, or <embed-slide> when checking slide.support. This ensures support for placement and style properties, and bundling of required styles.
• Breaking/Fix: <embed-slide> only overrides the natural dimensions of <iframe> and <video> embeds.
• Breaking: The <slide-controls> dialog header and content areas are renamed from .panel-header/.panel-controls to [slide-dialog=header]/[slide-dialog=contents].
• Breaking: Re-arrange and rename default controls.
• Breaking: Remove unnecessary slide-caption slot.
• New: Provide list of basic keyboard shortcuts in control panel.
• New: <slide-controls> default slot for appending additional controls.
• New: <embed-slide> accepts slide.place-content and slide.place-items for managing placement of embeds.
• New: <build-deck> has a default <slot> rendered before the slides, <slot name='after'> after the slides, and <slot name='controls'> for overriding the default <slide-controls>.
• Fix: <error-slide> won't fail when missing slide data.
• Styles: All slide color variables are re-calculated on [slide-canvas] based on the color-scheme of the slide.
• Styles: Slide-focus buttons are part of the layout, rather than being absolutely positioned over top.
• Styles: Move image credit to the left, avoiding conflicts with slide-focus button.
• Styles: Buttons are inverted from their surrounding colors by default, use the --slide-accent color for focus/hover, and the --slide-active color when pressed.
• Styles: Resets are moved from slides.contents to slides.base layer.
• Styles: Move @layer slide.theme near bottom of the layer order
• Styles: <slide-controls> backdrop is darker with a blurred backdrop-filter.