Create whats_new_0.8.3.md

service/whats_new_0.8.3.md

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+ - **Live camera view**. You can now see camera stream on camera entity page. Video streams are also supported as well as SVG images and any other type of cameras. Also with fullscreen option.
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+ - **New App settings menu**
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+ ![themes](https://ha-client.app/assets/images/whats_new/0.8/new_settings.png)
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+ - **Three application themes** available including **Dark theme**:
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+ ![themes](https://ha-client.app/assets/images/whats_new/0.8/themes2.png)
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+ - **New Gauge card**
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+ ![gauges](https://ha-client.app/assets/images/whats_new/0.8/gauge.png)
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+ - **Lovelace dashboards** support added. Dashboards without config will show sensors as badges and one big Entities Card for all other entities
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+ - **Webview is back!** Login with Home Assistant now works stable and can be performed without any browser. As well as pannels.
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+ - HA Client website was moved to *ha-client.app* domain and secured with ssl.
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+ - **Data caching** added to speed up UI appearance on slow network connections  
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+ - **state_filter** of different Lovelace cards are now fully supported
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+ - **double_tap_action** support
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+ - Spectrum link replaced with Discord server link. Join from main app menu!
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+ - **Location tracking** improvements
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+ - **Media player** volume buttons position fix
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+ - **Thermostat** temperature settings fix
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+ - **Header toggle** added for Entities Card
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+ - **Url sharing** feature was removed
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+ - **States UI** was removed as deprecated feature
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+ - **Bugfixes**