Added an English input system.

Updated version text.

Changed a message.

Fixed visual bugs.

Fixed bugs about an array.

Stability and some memory leaks have been improved.

Added kanji conversion and callbacks.

- Kanji conversion system thanks to the Google CGI API for Japanese Input.
- OnJPInput(string) is called when kanji is confirmed.
- OnBackspace() is called when B button is pressed and when conversion area is empty.

Added instruction.

Preparing for the beta release.