The twin of the builtInMemory but with less built ins defined for cases in which we want some commonly overwritten variables to remain open. If you do not know if you need the empty environment, you do not need the empty environment (right now).
Register a built-in constant (like NULL or TRUE) to the given BuiltIns
Register a single BuiltInDefinition to the given memories in BuiltIns
Register a built-in function (like print or c) to the given BuiltIns
Registers all combinations of replacements
The built-in environment is the root of all environments.
For its default content (when not overwritten by a flowR config), see the DefaultBuiltinConfig.