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Rename local variables to make them easy-to-read

Update ControlFlowModelingStage and ControlFlowGraph to render the control-flow graph properly in the ControlFlowModeling stage

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Update comments and remove an unnecessary method argument.

Make PopupMenu not assignable

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Remove an unnecessary parameter in the constructor of ControlFlowDelegator.java

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Make objectNode final and remove unnecessary initializer

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Fix typo

Make selectedOption final

Remove unnecessary initializer

Make some fields final and remove unnecessary initializer

Fix code to initialize properly when an active stage is changed from ControlFlowModelingStage to DataFlowModelingStage

Fix FlowLayerWindow to update their checkboxes properly

Make some properties final

Remove unnecessary comments

Fix typo

Remove unnecessary assignments

Fix comment

Fix typo and unnecessary assignments

Change modifiers of some properties

Add control flow modeling implementation for now

Add the necessary files

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Format files

Format files

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