SoUuidTrait for laravel and php8.1 support

1.0.2

Add SoUuidTrait and php8.1 tests

php8.0 support

support for php8.0 and travis.com

Types everywhere

This is the > 7.1 version of SoUuid introducing more strict types.

It is mostly a drop in replacement for 0.0.x with no other changes in interfaces than further typing argument and return values.

Base36

Adds base36 format (requires gmp)

Base62

Adds base62 format (requires gmp)
Fix getDateTime()

Initial Proposal

Interfaces should remain stable, but may be extended to handle/implement SoUuid versioning (if ever)