Meshtastic Python 2.3.15

What's Changed

• PowerMon/StructuredLogging support by @geeksville in #607
• Include uptime_seconds in sendTelemetry and print upon response by @ianmcorvidae in #638
• final powermon / power analysis reporting changes by @geeksville in #636
• Add/update some types to be at least as backwards-compatible as we can be by @ianmcorvidae in #647

Full Changelog: 2.3.14...2.3.15