V1.8-alpha4 Foundry v10 Compatibility Release

Continued Foundry V10 compatibility.

Still an alpha. Still buggy.

What's changed since alpha 3

• V10 actor import by @wrycu in #1093
• fix(v10): crits by @wrycu in #1094

Full Changelog: v1.8-alpha3...v1.8-alpha4