v14

What's Changed

• Replace flask by fastapi by @stephanme in #270
• Build but don't push arm/v7 image by @stephanme in #298
• implement support for home battery (SmaTripowerMeter only)
• Charging priority: AUTO, home battery or car
• fix: failed to start on pi2 due to missing RPi.GPIO
• many library updates

Full Changelog: v13...v14