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/EPUBCore/CFI/RDEPUBCFIPath.swift

@@ -0,0 +1,39 @@
+import Foundation
+
+public struct RDEPUBCFIPath: Codable, Equatable, Hashable {
+
+    public var steps: [RDEPUBCFIStep]
+
+    public init(steps: [RDEPUBCFIStep] = []) {
+        self.steps = steps
+    }
+
+    public func commonPrefix(with other: RDEPUBCFIPath) -> RDEPUBCFIPath {
+        var prefix: [RDEPUBCFIStep] = []
+        let upperBound = min(steps.count, other.steps.count)
+        for index in 0..<upperBound {
+            guard steps[index] == other.steps[index] else { break }
+            prefix.append(steps[index])
+        }
+        return RDEPUBCFIPath(steps: prefix)
+    }
+
+    public func droppingPrefix(_ prefix: RDEPUBCFIPath) -> RDEPUBCFIPath {
+        guard prefix.steps.count <= steps.count else { return self }
+        let candidate = Array(steps.prefix(prefix.steps.count))
+        guard candidate == prefix.steps else { return self }
+        return RDEPUBCFIPath(steps: Array(steps.dropFirst(prefix.steps.count)))
+    }
+}
+
+public struct RDEPUBCFIStep: Codable, Equatable, Hashable {
+
+    public var index: Int
+
+    public var idAssertion: String?
+
+    public init(index: Int, idAssertion: String? = nil) {
+        self.index = index
+        self.idAssertion = idAssertion?.rd_nilIfEmpty
+    }
+}