Release version 2.6: More reasonable behaviors and enhanced IME collaboration

This release features more reasonable behaviors and enhanced IME collaboration.

• The gesture of "View the state of BrlIMEHelper" becomes NVDA+windows+a.
• Interrupt braille composition at the correct chance.
• Get back to NVDA braille input during IME candidate selection.
• Better IME collaboration:
  1. Type full-shape characters from NVDA braille input.
  2. Manipulate the other east Asian IME through NVDA braille input.
• Improve the numpad dot-by-dot braille input.
• The internal code braille representation.
• Several new options to control the add-on behavior in detail.

A new bug is found. The general input mode does not work in Chrome LINE. We will solve the problem ASAP.

A detailed description in Chinese can be found here.