Drools

* Implementation of OOPathExpr

Added simpler test case for OOPath

* Removed processing of RuleImpl

* Refactor

* Refactor FromVisitor to use optional initializer expression in the DeclarationSpec

* Moved extractGenericType to ClassUtils.java

Renamed to DeclarationSource

use Option.ifPresent rather thatn optToStream.forEach

Removed unused RuleImpl

* Use monadic flatMap rather than using two different constructors

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