Added font options for EpubAozora of GenerateView.

1. Implement the display page number feature in GenerateView (need to be enabled in options).

2. New TextFont options:
TextFontSize: Determine the font size of Epub or Aozora eBooks displayed in GenerateView (Default 30).
TextFontName: Determine the font of Epub or Aozora eBooks displayed in GenerateView (Default "[FontFamily: Name=Microsoft Sans Serif]").
TextFontBold: Determines whether the font style of Epub or Aozora eBooks in GenerateView is bold (Default true).
TextFontItalic: Determines whether the font style of Epub or Aozora eBooks in GenerateView is italic (Default false).

3. New WebViewStyle options:
WebViewLineHeight: Determine the line-height style of Epub or Aozora eBooks in GenerateView's WebView (Default 200%).
WebViewFontSize: Determine the font-size style of Epub or Aozora eBooks in GenerateView's WebView (Default 140%).

Author: avan06