Fix speech stopping after a short while

Commit message

Fix speech stopping after a short while

• Seems to be related to changes made after the premium version was made, but before v3.0.0.
• Suspension code was made more resilient to suspend/unload timing issues.
• Logging to strings was introduced to help with console-to-terminal logging in Chrome.
• Promise-based logging was introduced for some events handlers.
• Speech stopping after a short while was traced to the newly introduced logging levels.
• Turning off debug logging seems to also stop speech, when triggered from the popup and the popup was unfocused/unlaoded.
• Storing a reference to the current utterance on the background window object seems to prevent the problem.
• Might be related to garbage collection and speech synthesis using weak references.
• With this many changes, it's hard to tell (although not at all untestable) if a single change made all the difference. Keeping all changes, assuming that they are all improvements.

Fix speech stopping after a short while

- Seems to be related to changes made after the premium version was made, but before v3.0.0.
- Suspension code was made more resilient to suspend/unload timing issues.
- Logging to strings was introduced to help with console-to-terminal logging in Chrome.
- Promise-based logging was introduced for some events handlers.
- Speech stopping after a short while was traced to the newly introduced logging levels.
- Turning off debug logging seems to also stop speech, when triggered from the popup and the popup was unfocused/unlaoded.
- Storing a reference to the current utterance on the background window object seems to prevent the problem.
- Might be related to garbage collection and speech synthesis using weak references.
- With this many changes, it's hard to tell (although not at all untestable) if a single change made all the difference. Keeping all changes, assuming that they are all improvements.