Fixed Issue that Highlight Menu does not show after selecting text sometimes.

Issue that Text Selection is failed and jumps to the next page sometimes is resolved.
Advanced Demo has been modified for SDK 28.

SkyEpub 8.0.0 for iOS and Android Released.

Lot of Issues are Resolved and Fixed.
SDK Engine has greatly Improved.
Global Pagination functions are Enhanced.
Search functions have highly Improved.
Ready for iOS 13.x.
Ready for Android SDK 28.

Reflowable Layout.

* a lot of issues resolved.
* issues regarding text extraction/TTS resolved.
* issues related to permissions resolved.
* stability enhanced.

Reflowable Layout
* lot of issues resolved.
* stability enhanced.

Fixed the issue that epub is not deleted after opening the book in some Windows versions.

Advanced demo for Android is now provided for Android Studio.

Reflowable Layout
fixes the issues that curling page does not work properly in some devices.
enlarges the touch dragging area for Carets when text is selected.
fixes the issues that selection area is not displayed when setSwipeEnabled is false.

Fixed Layout
fixes the issue that curling page malfunctions in targetSDKVersion 22 or above.
fixes the issue that thumbnails are not generated in targetSDKVersion 22 or above.