[Feature Request] AI service improvements/fixes

So I have a few issues here with the AI service. I didnt know how to package this so I apologize for the discombobulation. I didnt want to create a half a dozen separate issue reports.

1. Untether the graphics widgets requirement from the image mode. I prefer the old text style notifications and image mode doesnt work unless widgets are enabled.

2. When using speech mode with pause, change the timing so it pauses, then reads back the dialogue. at current it pauses and doesnt read dialogue until you unapause. This does you no good if you have dialogue that you cant control the rate of and youre trying not to fall behind/miss any. Even if you can control the rate, it renders the pause setting entirely useless in this mode.

3. Enable some kind of perpetual mode for both image & speech. (I assume narrator mode is supposed to be the aforementioned for speech mode). For either mode, having to hit your hotkey over and over for every line of dialogue you run across in a foreign rpg will get incredibly tiresome incredibly fast. At current, narrator mode seems to do nothing at the moment.

I prefer to use image mode but cant A) because i use old style notifications and B) because i cant fathom having to hit my hotkey for every piece of dialogue in a game from beginning to end.

Start by locating RetroArch's AI service entry points and the code handling image mode, speech mode, pause timing, widgets, and narrator mode; no files or tests are named in the issue. Reproduce each reported behavior and clarify the intended design before changing it. Done means the three requested behaviors work without regressing existing modes.