Move to smart pointers and split out ParsedText class (#6)

* Move to smart pointers and split out ParsedText class

* Cleanup ParsedText

* Fix clearCache functions and clear section cache if page load fails

* Bump Page and Section file versions

* Combine removeDir implementations in Epub

* Adjust screen margins

lib/Epub/Epub/ParsedText.h

@@ -0,0 +1,29 @@
+#pragma once
+
+#include <EpdFontFamily.h>
+
+#include <cstdint>
+#include <list>
+#include <memory>
+#include <string>
+
+#include "blocks/TextBlock.h"
+
+class GfxRenderer;
+
+class ParsedText {
+  std::list<std::string> words;
+  std::list<EpdFontStyle> wordStyles;
+  TextBlock::BLOCK_STYLE style;
+
+ public:
+  explicit ParsedText(const TextBlock::BLOCK_STYLE style) : style(style) {}
+  ~ParsedText() = default;
+
+  void addWord(std::string word, EpdFontStyle fontStyle);
+  void setStyle(const TextBlock::BLOCK_STYLE style) { this->style = style; }
+  TextBlock::BLOCK_STYLE getStyle() const { return style; }
+  bool isEmpty() const { return words.empty(); }
+  std::list<std::shared_ptr<TextBlock>> layoutAndExtractLines(const GfxRenderer& renderer, int fontId,
+                                                              int horizontalMargin);
+};