Use Slot/Fill instead of hardcoded components

Disable slots/fills in global editor block navigator

Grab clientId from context instead of requiring a prop

Improve readability of block-navigation/list.js

Use context to determine whether or not given BlockNavigation may be customized with slots

Restore default value for selectBlock in navigation-structure-panel.js

Remove obsolete onChange passed to NavigationStructurePanel

Use constant value for BlockNavigationContext

Use memo() in BlockStyles

Remove performance changes from BlockStyles

Generalize BlockNavigationListItem and remove the BlockNavigationListItemFill for now

Rename useBlockNavigationSlots to withBlockNavigationSlots

Restore RichText in the navigator

Sort out BlockNavigationListItem and BlockNavigationListItemWrapper

Rename BlockNavigationListItemWrapper to BlockNavigationBranch

…thBlockNavigationSlots