Initial release

A nice cli for valheim_server.exe copied from my Python project into Rust for a single-executable experience.

Features:

• Process/logging handling for valheim_server.exe
• Ability to send arguments via environment variables
• Loading of envvars from an exe-adjacent .env file using bash-like syntax

VALHEIM_EXE_PATH='.'  # path containing the executable
VALHEIM_SAVES_PATH='.'  # path containing worlds
VALHEIM_SERVER_NAME='etc'  # name as it appears to Steam
VALHEIM_WORLD_NAME='Dedicated'  # savefile name
VALHEIM_PORT='2456'  # port binding
VALHEIM_PWD='secure'  # protection for your server