beta-4.7: Text speed change.

Improvements

• Sped up the text typing and deletion animations. For typing, the delay between each character is now 0.02 seconds instead of 0.05, so 2.5 times faster. For deletion, the delay between each character is now 0.002 seconds instead of 0.01, so 5 times faster.
• Increased the time the text stays fully typed from 1 second to 1.5 seconds.
• Decreased the time no text is shown from 1 second to 0.5 seconds.
• Added a macOS release.
• Updated itch.io description regarding the testing of different releases.