2916: Add tts on ios

[f1sh1918]

Short description

Ios internally uses the wrong function for stop tts and is therefore sending the wrong Events and even twice.
I don't think we can do here anything, i already checked the native bindings if we could patch there something.
Therefore i added some tweaks here to workaround the event sending issues we have on ios.
Thats really not a clean way so feel free to provide a better solution

Proposed changes

• implement a suppress function for ios to skip wrongly triggered finish event
• use pause function instead of stop for ios. This enables to continue at the exact position and avoids event finish issues
• since manual play next or previous triggers immeditately 'tts-finish' that triggers playNextAuto (Event listener) , i had to adjust the particular function for ios.
• add a working speech rate for ios

Issues

• Note at the first sentence in some case it repeats the sentence instead of moving forward. I think thats okay for some beta state.

Side effects

• hopefully none

Testing

1. Go to second level text and open "Vorlesefunktion" via "..." Menu. Start and stop reading. Even go next and previous.

Resolved issues

Fixes: #2917

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[f1sh1918]

I really tried to create a less "hacky" solution by introducing this "suppressEvent" function but to use it in all "manual" triggers like previous, next and pause also leads to issues, so i had to use even more hacky workarounds.
Even it seem to work quite fine now for both platforms, i'm aware thats far away from a good solutions, so feel free to challenge that and propose sth better. I really spent a huge amount of hours in trying ;)

Also this ios issue that i linked is opened since ios15 (4years+) i don't expect that this will be fixed soonish tbh.

[LeandraH]

Wow, that looks pretty ugly indeed, thank you for explaining at each step of the way why you were doing what, and for slogging through that mess! Tested on real iOS

[f1sh1918]

Wow, that looks pretty ugly indeed, thank you for explaining at each step of the way why you were doing what, and for slogging through that mess! Tested on real iOS

When I realized what the issue is, i should have come to the conclusión to just remove the event listener and readd after stop. So I guess this PR is outdated and we should check Steffens. Sometimes i get lost in the woods 😁