Boomerang Builder

The Reactor assembly API for Boomerang. Builder is the API driven by the code that boomerang_derive generates.

The most important data structure for Builder is the [EnvBuilder], which also serves as the API entry-point. Once all of the Reactors and Reactions have added their graph state into the [EnvBuilder], [EnvBuilder::into_runtime_parts] is called to generate the data for the Runtime.

Most users will not need to interact with Builder, but for some specialized cases it is useful to manually implement the [reactor::Reactor] and [reaction::Reaction] traits manually. It may also ocasionally useful to manually adjust the [EnvBuilder] graph after all the Reactors have been built.