Implements the 'aws_ec2' target type, which uses AWS SDK to create and terminate EC2 virtual machines.

Implements the 'forward' type, which is essentially a dummy that doesn't really make any external calls, but simply forwards connections to a fixed address.

Implements the 'hcloud' target type, which uses HCLOUD SDK to create and terminate hcloud virtual machines.

Implements the 'virtualbox' target type, which uses the VirtualBox CLI to start/stop existing virtual machines.

Register registers a provider factory.

Machine represents a running machine, and holds channels via which the Provider receives commands from the Manager.

TranslateMsg is the type sent on the Machine Translate channel.

Factory produces a Provider for a specific type of Machine, based on 'target' configuration provided by the user.

Provider is responsible for managing the Machine lifecycle.

Factories is an index of Factory objects by Machine type name.

Providers is an index of configured Provider instances by Machine type name.