Valetudo RE 0.9.7

This is the next release of RE version, verified on S55 (fw 2020).
Notable changes in this version:

• Added live map to manual control tab. It is guaranteed to (mostly) proper work on Gen2 with firmware version 2008 and later, on other versions the map behavior is hardware dependent. This feature can be disabled in web interface settings.
• Added an option to auto-restore chosen pre-saved map when device enters the dock to charge;
• Improved map saving interface, a list of available maps is now shown so it's easy to rewrite them;
• A map slot id now can be specified as a source for /api/simple_map (use case: #261);
• MQTT's "play_sound" command now can use sox audio player if it's available on the device (use case: #264);
• Last lines of Valetudo system log are now shown on Info page in Settings tab;
• A few bugs were fixed.