v0.8.0

• Add SegmentedControl, ProgressIndicator, SearchField, TokenField, ComboBox, Stepper, PathControl, StatusIndicator, and DisclosureGroup components.
• Add FlexibleSpacer that is also available via NSView.flexibleSpacer().
• Add HelpButton and onHelp closure to PreferenceButtonSection.
• Add control size parameter to Button.
• Fix tab navigation from one control to another in PreferenceList.
• Fix alignment issues in PreferenceSection and PreferenceGroup. This should remove the need to insert trailing NSView spacers in horizontal view stacks.
• Add workspace that includes Example project and update example to better demonstrate all components.