Update Upstream Frameworks

This updates to the latest upstream ESP8266 framework as well as the Arduino 3.x core as recently released by Espressif.

What's Changed

• Bring eSPI up to date with v16_prerelease by @thorrak in #107
• Merge prerelease changes by @thorrak in #108
• Track Gravity on Tilts by @thorrak in #109
• Add/Fix eSPI Screen Driver by @thorrak in #110

Full Changelog: v16-alpha0...v16-alpha1