Remove hardcoded module and type names

[alexeyr]

See ScalanPluginConfig and maps in ScalanPluginState

[alexeyr]

@Module from #8 either has an argument for modules this module depends on, or they are discovered automatically (how? Maybe use specific dependencies in self-types?).

[alexeyr]

All modules can be collected as the first stage of plugin, their dependencies as the second (if needed).