VE: Refactor aadl classes

• Merge AADLObject and DeployObject -> VEObject
• Rename AADLModel,AADLFunction, ... to IVModel, IVFunction, ...
• Rename graphic items AADLFunctionGraphicsItem, ... to IVFunctionGraphicsItem, ...
• Rename DeployBus, DeployDevice, ... to DVBus, DVDevice, ...
• Rename aadl library in ivdata (or similar)
• Merge attributes and properties
• Update tests to reflect the naming
• Cleanups