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

ReadViewDemo/Pods/Target Support Files/RDEpubReaderView/RDEpubReaderView-umbrella.h

@@ -0,0 +1,16 @@
+#ifdef __OBJC__
+#import <UIKit/UIKit.h>
+#else
+#ifndef FOUNDATION_EXPORT
+#if defined(__cplusplus)
+#define FOUNDATION_EXPORT extern "C"
+#else
+#define FOUNDATION_EXPORT extern
+#endif
+#endif
+#endif
+
+
+FOUNDATION_EXPORT double RDEpubReaderViewVersionNumber;
+FOUNDATION_EXPORT const unsigned char RDEpubReaderViewVersionString[];
+