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/EPUBUI/ReaderController/RDEPUBReaderUIState.swift

@@ -0,0 +1,34 @@
+import Foundation
+
+struct RDEPUBReaderUIState {
+
+    let canToggleBookmark: Bool
+
+    let hasBookmarkAtCurrentLocation: Bool
+
+    let canShowBookmarks: Bool
+
+    let canAddHighlight: Bool
+
+    let canShowHighlights: Bool
+
+    let showsTableOfContents: Bool
+
+    let allowsHighlights: Bool
+
+    let showsSettingsPanel: Bool
+}
+
+extension RDEPUBReaderUIState {
+
+    static let empty = RDEPUBReaderUIState(
+        canToggleBookmark: false,
+        hasBookmarkAtCurrentLocation: false,
+        canShowBookmarks: false,
+        canAddHighlight: false,
+        canShowHighlights: false,
+        showsTableOfContents: true,
+        allowsHighlights: true,
+        showsSettingsPanel: true
+    )
+}