Change to `MediaPlayer` API to allow waiting for the player to be in a ready state.
This is needed in order to perform some tasks (e.g. read the media duration, seek) after changing the media file.
* Iterate design on Settings screen:
- Set new icons provided by design.
- Replace `PreferenceText` usages with `ListItem`.
- Add missing icons, and a new way to group them for previews.
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Co-authored-by: ElementBot <benoitm+elementbot@element.io>
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## Type of change
- [ ] Feature
- [x] Bugfix
- [ ] Technical
- [ ] Other :
## Content
Code now checks whether the mx uri is invalid and handles the error condition properly.
## Motivation and context
https://github.com/vector-im/element-x-android/pull/1748#discussion_r1384557443
## Screenshots / GIFs
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## Tests
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## Tested devices
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## Checklist
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- [ ] Changes have been tested on an Android device or Android emulator with API 23
- [ ] UI change has been tested on both light and dark themes
- [ ] Accessibility has been taken into account. See https://github.com/vector-im/element-x-android/blob/develop/CONTRIBUTING.md#accessibility
- [ ] Pull request is based on the develop branch
- [ ] Pull request includes a new file under ./changelog.d. See https://github.com/vector-im/element-x-android/blob/develop/CONTRIBUTING.md#changelog
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- [ ] You've made a self review of your PR
