v3.16.0 - turn off dotstar at end, fix compiler warning, add Trinkey SHT4x

What's Changed

• do not leave dotstar on after exiting bootloader by @rlcamp in #208
• Update cdc_enumerate.c by @NasserN in #205
• nu trinkey by @ladyada in #211

New Contributors

• @rlcamp made their first contribution in #208
• @NasserN made their first contribution in #205

Full Changelog: v3.15.0...v3.16.0