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/Pagination/RDEPUBTextPaginationSupport.swift

@@ -0,0 +1,19 @@
+import CoreText
+import UIKit
+
+extension NSAttributedString {
+
+    func rd_paginatedFrames(
+        size: CGSize,
+        fragmentOffsets: [String: Int] = [:],
+        config: RDEPUBTextLayoutConfig = .default
+    ) -> [RDEPUBTextLayoutFrame] {
+        let factory = RDEPUBCoreTextPageFrameFactory(attributedString: self, pageSize: size, config: config)
+        let counter = RDEPUBChapterPageCounter(factory: factory)
+        return counter.layoutFrames(fragmentOffsets: fragmentOffsets)
+    }
+
+    func ss_pageRanges(size: CGSize) -> [NSRange] {
+        rd_paginatedFrames(size: size).map(\.contentRange)
+    }
+}