refactor: rename RDReaderView -> RDEpubReaderView, update pod config and docs

- Rename source module from RDReaderView to RDEpubReaderView
- Move all source files from Sources/RDReaderView/ to Sources/RDEpubReaderView/
- Update podspec: RDReaderView.podspec -> RDEpubReaderView.podspec
- Update Podfile, demo project, and CocoaPods config for new pod name
- Delete old RDReaderView pod support files from ReadViewDemo/Pods
- Add new RDEpubReaderView pod support files
- Update documentation (API ref, architecture, UML, conventions, etc.)
- Add FixedLayoutRotationTests
- Update .gitignore: exclude .DS_Store, manual unpack backups, _ssoft-output

Sources/RDEpubReaderView/ReaderView/RDEpubReaderViewProtocols.swift

@@ -0,0 +1,89 @@
+
+import UIKit
+
+@available(*, deprecated, message: "Use RDEpubReaderPageProvider instead.")
+@objc public protocol RDEpubReaderDataSource: NSObjectProtocol {
+
+    func pageCountOfReaderView(readerView: RDEpubReaderView) -> Int
+
+    func pageContentView(readerView: RDEpubReaderView, pageNum: Int, containerView: UIView?) -> UIView
+
+    func pageIdentifier(readerView: RDEpubReaderView, pageNum: Int) -> String?
+
+    @objc optional func topToolView(readerView: RDEpubReaderView) -> UIView?
+
+    @objc optional func bottomToolView(readerView: RDEpubReaderView) -> UIView?
+}
+
+@objc public protocol RDEpubReaderPageProvider: NSObjectProtocol {
+
+    func numberOfPages(in readerView: RDEpubReaderView) -> Int
+
+    func readerView(_ readerView: RDEpubReaderView, viewForPageAt index: Int, reusableView: UIView?) -> UIView
+
+    @objc optional func pageIdentifier(in readerView: RDEpubReaderView, index: Int) -> String?
+
+    @objc optional func readerViewTopChrome(_ readerView: RDEpubReaderView) -> UIView?
+
+    @objc optional func readerViewBottomChrome(_ readerView: RDEpubReaderView) -> UIView?
+}
+
+@objc public protocol RDEpubReaderDelegate: NSObjectProtocol {
+
+    func pageNum(readerView: RDEpubReaderView, pageNum: Int)
+
+    @objc optional func readerViewOrientationWillChange(readerView: RDEpubReaderView, isLandscape: Bool)
+}
+
+public protocol RDEpubReaderPageNavigating: AnyObject {
+
+    var currentPage: Int { get }
+
+    func reloadPages()
+
+    func transition(to page: Int, animated: Bool)
+}
+
+extension RDEpubReaderView {
+
+    public enum DisplayType {
+
+        case pageCurl
+
+        case horizontalScroll
+
+        case verticalScroll
+    }
+
+    public enum PageDirection {
+
+        case leftToRight
+
+        case rightToLeft
+    }
+}
+
+final class RDEpubReaderLegacyDataSourceAdapter: NSObject, RDEpubReaderPageProvider {
+
+    weak var dataSource: RDEpubReaderDataSource?
+
+    func numberOfPages(in readerView: RDEpubReaderView) -> Int {
+        dataSource?.pageCountOfReaderView(readerView: readerView) ?? 0
+    }
+
+    func readerView(_ readerView: RDEpubReaderView, viewForPageAt index: Int, reusableView: UIView?) -> UIView {
+        dataSource?.pageContentView(readerView: readerView, pageNum: index, containerView: reusableView) ?? UIView()
+    }
+
+    func pageIdentifier(in readerView: RDEpubReaderView, index: Int) -> String? {
+        dataSource?.pageIdentifier(readerView: readerView, pageNum: index)
+    }
+
+    func readerViewTopChrome(_ readerView: RDEpubReaderView) -> UIView? {
+        dataSource?.topToolView?(readerView: readerView)
+    }
+
+    func readerViewBottomChrome(_ readerView: RDEpubReaderView) -> UIView? {
+        dataSource?.bottomToolView?(readerView: readerView)
+    }
+}