This commit will:
- Add a new class OutlineView that extends NSOutlineView adding support
  for reducing motion
- Change HistoryWindowController.xib to use OutlineView instead of
  NSOutlineView

This suppresses the sliding animation when collapsing and expanding
rows in the playback history window.

This commit will change IINA to adhere to the Apple Human Interface
Guidelines with respects to the macOS "Reduce motion" setting. With
these changes IINA will reduce, not eliminate, animations when the macOS
reduce motion setting is enabled. When this setting is enabled IINA will
fade in the sidebar instead of sliding it into view. All other changes
to animation behavior, such as how IINA transitions in and out of full
screen mode, are provide by AppKit.

For users who are hyper sensitive to motion this commit adds an
"Enable animations" setting to the UI settings tab in a new "Animations"
section at the bottom of the panel. Disabling this setting will
eliminate many, but not all, animated transition effects.

This commit will change IINA to adhere to the Apple Human Interface
Guidelines with respects to the macOS "Reduce motion" setting. With
these changes IINA will reduce, not eliminate, animations when the macOS
reduce motion setting is enabled. When this setting is enabled IINA will
fade in the sidebar instead of sliding it into view. All other changes
to animation behavior, such as how IINA transitions in and out of full
screen mode, are provide by AppKit.

For users who are hyper sensitive to motion this commit adds an
"Enable animations" setting to the UI settings tab in a new "Animations"
section at the bottom of the panel. Disabling this setting will
eliminate many, but not all, animated transition effects.

This commit will change IINA to adhere to the Apple Human Interface
Guidelines with respects to the macOS "Reduce motion" setting. With
these changes IINA will reduce, not eliminate, animations when the macOS
reduce motion setting is enabled. When this setting is enabled IINA will
fade in the sidebar instead of sliding it into view. All other changes
to animation behavior, such as how IINA transitions in and out of full
screen mode, are provide by AppKit.

For users who are hyper sensitive to motion this commit adds an
"Disable animations" setting to the UI settings tab in a new
"Accessibility" section at the bottom of the panel. Enabling this
setting will eliminate many, but not all, animated transition effects.

This commit will change IINA to adhere to the Apple Human Interface
Guidelines with respects to the macOS "Reduce motion" setting. With
these changes IINA will reduce, not eliminate, animations when the macOS
reduce motion setting is enabled. When this setting is enabled IINA will
fade in the sidebar instead of sliding it into view. All other changes
to animation behavior, such as how IINA transitions in and out of full
screen mode, are provide by AppKit.

For users who are hyper sensitive to motion this commit adds an
"Disable animations" setting to the UI settings tab in a new
"Accessibility" section at the bottom of the panel. Enabling this
setting will eliminate many, but not all, animated transition effects.