Auto-restart inverter feature, some fixes for potential crashes

What's Changed

• Huawei solar initial support code by @springfall2008 in #731
• Auto re-start inverter feature by @springfall2008 in #732
• Update predbat.py - Try to catch some potential crashes by @springfall2008 in #736
• Update predbat.py by @springfall2008 in #737
• Huawei updates by @springfall2008 in #738

Full Changelog: v7.15.16...v7.15.17