Upgrade guide

Upgrade 1.1 -> 2.0

The purpose of the SidebarManager is changed. The manager is now only responsible for registering the Sidebar, not for building.
Instead of directly building the menu in $manager->build(), you will have to create a new class which implements Maatwebsite\Sidebar\Sidebar. Register this custom Sidebar with the manager: $manager->register(YourSidebar::class); (See full example in Wiki)
To render your Sidebar (in a view creator for example) you will have to inject your custom Sidebar class and Maatwebsite\Sidebar\Presentation\SidebarRenderer and render like $this->renderer->render($this->sidebar) (See full example in Wiki)
It's no longer possible to use multiple view composers to fill the sidebar, due to caching implementation. Instead create a new class that extends Maatwebsite\Sidebar\SidebarExtender and add it to your Sidebar. (See full example in Wiki)
To resolve the sidebars you need to add 'Maatwebsite\Sidebar\Middleware\ResolveSidebars' to your middlewares in App\Http\Kernel

addItem() -> item()
Magic getters and setters are removed. $group->weight = 0 -> $group->weight(0);
$badge->color = '' -> $badge->setClass();
$badge->value = '' -> $badge->setValue();
Class SidebarGroup -> interface Group
Class SidebarItem -> interface Item
Class SidebarBadge -> interface Badge
Class SidebarAppend -> interface Append