Change Impact: modify drools-compiler so that information is collected during compilation

The problem is that Action instances created at compile time by drools-compiler contain reference information that can otherwise not be retrieved by parsing the DRL.

The code associated with this issue adds an (compiler) option to retrieve this information during compilation, so that (indexer) code in the workbench can take advantage of this code so subsequently index and use when analysing change impact and doing refactoring operations.