Fixes for compiler warnings

• Add id: .self to remove the ForEach warnings
• Update functionBuilder to resultBuilder

Pull request #24 by @ezefranca

Bug fixes & new features

• ForEach-style init (Support ForEach #17)
• Fix drag animation (On watchOS: drag ended animation starts from full previous screen #12)
• Ability to choose drag gesture type using PageGestureType
• PageScrollState is @StateObject instead of @ObservableObject, which prevents memory leaks
• Bumped deployment target to iOS 14 and watchOS 7

Some of changes/features here are based on work of @gregcotten in #13

Changed framework's bundle identifier in xcodeproj

Changed framework's bundle identifier, which caused inability to run apps on device when using Carthage (Carthage/Carthage#2559 (comment))

Binding for selected page

New features:

• ability to programmatically control selected page using selectedPage Binding
• pageSwitchThreshold parameter, which control distance that needs to be scrolled, to qualify as page switch

Fixed issue with PageControlTheme init being internal

Fixed issue with PageControlTheme init being internal.

Fixed issue with PageControl offset

Fixed issue with PageControlTheme.offset not being used.

API changes:

• PageControlTheme.offset -> xOffset for vertical mode & yOffset for horizontal mode

Fixed issue with gesture precedence

Fixed issue with gesture precedence (#2), causing button tap to be recognized before DragGesture

Performance improvement

Performance improvement by removing AnyView/Group components causing scrolling not being smooth on slower devices like Apple Watch.

• New API: HPageView and VPageView according to chosen scroll direction
• Ability to specify pages using function builder syntax style

PageControl alignment

Added ability to control alignment of PageControl component inside PageView.

Vertical PageView

• vertical PageView option
• slowed down scrolling when draging out of bounds (currently linearly)