Improve parameter and global variables handling, and summary
* Migrated `NodeType`s to specific `GraphNode` child classes. * Revamped creation of SDG * Added ASDG and PSDG, based on the APDG and PPDG. * Improved handling of variable usages, definitions and declarations. * Added movable variable actions, that can be placed in a CFG node and then relocated to their own PDG node. * Added fix-point and specific slicing algorithm to summary arc generation. * Documentation of most methods (public and private). * Removed unused elements. * Fix possible errors by migrating all maps whose key is an AST node to IdentityHashMap.
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mentioned in issue #34 (closed)
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mentioned in issue #18 (closed)
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