updated the icon on TTS engine for android

[paolo-caroni]

As promised here at @csukuangfj I have updated the icon logo.

WARNING: to create the xml files I have vectorized the bitmap image provided with the pdf, especially for foreground start from a vectorial image would lead to less space, since that it should be done to the original author or he/she will send me the official .svg.

Since the space problem I have updated only SherpaOnnxTtsEngine icons, not the other on this repo, that I think would be updated too.

About the fastlane directory I will wait untill #569 is resolved.

[csukuangfj]

Thanks!

Could you post a screenshot about the app after applying this pull request?

[paolo-caroni]

Honestly I have not yet compiled it, it's only an image change, not a code change, you can see the webp image raw directly on the repo, for example here:
https://raw.githubusercontent.com/paolo-caroni/sherpa-onnx/master/android/SherpaOnnxTtsEngine/app/src/main/res/mipmap-xxxhdpi/ic_launcher.webp

If you want in the next days I will compile it (for the first time, but I have seen that is well documented) and then post here a screenshot :)

Edit: I have compiled it and the icon don't change, I wiil understand why and then add a correction commit. I'm really sorry

[paolo-caroni]

Ok, I have corrected it, the problem was that the resolution was too high, too much vectorial points, on android studio I see the previews but on compiling give an error (string too large), sorry.
Here you have the screenshots. I have removed much details from the logo, I would be happy to redone all with the support of the original desiner.

[paolo-caroni]

@csukuangfj I'm really sorry that I assumed everything would work just by looking at the preview. I'm sure that you have noticed it and asked me a screenshot because of this.

[csukuangfj]

Great!

Thank you for your contribution!