* Add UseCaseController
* Add Layouts.swift
* Add PagePanelController
* Append access modifiers into some objects
* Split view controllers into each file
* Organize the project
* Rename currentMenu with currentUseCase
* Rename SampleListVC with MainVC
* Update UseCase enum
* Update DebugTableViewController to test the scroll (un)tracking functions
* Support over 3 states in LayoutAdapter
* Allow to inherite FloatingPanelState
* Support a custome FloatingPanelState in ObjC
* Replace Menu enum with UseCase enum in Samples.app
* Rename UIExtensions to Extensions
* Add CustomState use case in Samples app
* Reset the moveAnimator prop after a move animation
If `moveAnimator` isn't null, `FloatingPanelPanGestureRecognizer.touchesBegan`
detects `began` state quickly so that it doesn’t allow to work a tap gesture or
tap action in a panel.
Resolve#392
* Add 2 buttons in DebugTableViewController
* Add BottomEdgeInteractionLayout sample
* Support v2
* Use FloatingPanelSurfaceAppearance
* Fix 'Tab Bar > Layout 3' in Samples.app
* Remove interactionBuffer(for:) from Samples.app
* add floatingPanel(_:contentOffsetForPinning:)
* add 'Show NavigationController' sample
* fix the initial content offset in a navigation bar with a large text
The content offset preservation should be applied only when
`FloatingPanelController.contentInsetAdjustmentBehavior` is `.always`.
This is because the library user loses control of the initial offset.
* Add sample code
* Fix updateInteractiveTopConstraint()
* {min,max}Y variables are confusing because it's not a value of coordinate Y,
but a constant value from the `interactiveTopConstraint`.
The default Swift version leaves 4.0. Because it avoids build errors
with Carthage on each Xcode version from the source compatibility
between Swift 4.0, 4.2 and 5.0.
With regard to CocoaPods, the pod spec is going to support
`swift_versions` introduced in CocoaPods v1.7.0. For now, a user needs
to override `SWIFT_VERSION` appropriately in Podfile.