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/EPUBTextRendering/BuildPipeline/RDEPUBTextBuildPipelineInterfaces.swift

@@ -0,0 +1,48 @@
+
+import UIKit
+
+protocol RDEPUBTextBookBuilding {
+
+    func build(
+        parser: RDEPUBParser,
+        publication: RDEPUBPublication,
+        pageSize: CGSize,
+        style: RDEPUBTextRenderStyle
+    ) throws -> RDEPUBTextBook
+}
+
+struct RDEPUBChapterRenderPipeline {
+    private let renderer: RDEPUBTextRenderer
+
+    init(renderer: RDEPUBTextRenderer) {
+        self.renderer = renderer
+    }
+
+    func render(_ request: RDEPUBTextChapterRenderRequest) throws -> RDEPUBRenderedChapterContent {
+        try renderer.renderChapter(request: request)
+    }
+}
+
+struct RDEPUBChapterPaginationPipeline {
+    private let frameFactory: RDEPUBPageFrameBuilding
+
+    init(frameFactory: RDEPUBPageFrameBuilding = RDEPUBCoreTextPageFrameFactory()) {
+        self.frameFactory = frameFactory
+    }
+
+    func frames(
+        for content: NSAttributedString,
+        pageSize: CGSize,
+        config: RDEPUBTextLayoutConfig,
+        fragmentOffsets: [String: Int]
+    ) -> [RDEPUBTextLayoutFrame] {
+        frameFactory.makeFrames(
+            attributedString: content,
+            pageSize: pageSize,
+            config: config,
+            fragmentOffsets: fragmentOffsets
+        )
+    }
+}
+
+extension RDEPUBTextBookBuilder: RDEPUBTextBookBuilding {}