corrected unit test to ignore non top-level entities
updated VHDL RAM entities (true dual and pseudo dual)
corrected VHDL implementation of synchronous FIFO
updated port bindings for new (true) dual-port RAM
corrected bug in the builder due to random order of URIs
the instantiator expects modules to be updated in a top down fashion.
The CxBuilderState declares its own ordered version of ToBeBuilt that
uses a linked hash set.
refactoring and adding export configuration
moved ngDesign-specific stuff from "core" to "ngDesign" plugin
added IExportConfiguration
updated features
updated exporter using IExportConfiguration
removed/refactoring constants