Release version 4.0.0

• Add configurable silence options for line endings, sentences, exclamations and questions.
• Add playback-on-input mode.
• Add support for reading text through the text action (thanks to @KevinSJ).
• Add text filters for omitting certain text elements from the audio.
• Allow queueing tasks and processing multiple text files.
• Backport the application to Android 4.0.3.
• Translate the app into Simplified Chinese (thanks to mahongyin).
• Various other improvements and error corrections.