Standalone application for the post-Chrome-Web-Store era

Welcome to the new world. We hope you like it! :wink:

The move to a standalone application has been made necessary by Google's announcement that they will be removing support for Chrome Web Store apps from all platforms (except ChromeOS) in 2018.

To install the application on your computer, download the archive for your platform, open it, and copy its contents onto your hard drive. (We will be looking into adding a fancy installer at a later stage.)

The standalone application does not support automatic updating like the Chrome Web app did. But there will be a popup shown on startup of the configurator whenever there is a newer version available, and you will be directed to visit the release page and download / install the new version.

Big thanks to @sebsx and @basdelfos for their tireless efforts to bring us the standalone application, and everybody else who helped with fixes and testing / feedback.

As usual, please report issues back to https://github.com/betaflight/betaflight-configurator/issues.

Fixes:

• beeper configuration;
• filter configuration enabling / disabling.

New GUI support for the following firmware features:

• serial RX / SPI RX protocols;
• OSD warnings and other OSD elements.

Improvements:

• standalone application support;
• automatically assign modes based on stick movement;
• firmware version display in top bar;
• documentation updates.