Add null-check for AbstractMutator#isEqual method
Add null-guard for AbstractRAMutator
Add dry-run options
Use enum for representing state of MutationFile so that we can distinguish equivalent mutants
Implement a mutationViewer inttial GUI with ListView and label
Introduce model class so that mutation viewer can display both mutation itself and those category
Implement basic view/controller to show both category and mutant in mutation_viewer's left bar
mutation_viewer, rewrite interface with TreeView
mutation-viewer add checkbox to indicate mutants' state
mutation viewer: enable filter not to display equivalent/killed mutants
mutation viever; move resources into mutation_viewer foler
mutation viewer: Add save button and save function
Implement DiffParser to extract information from *.diff file to be used in mutation viewer
mutation viewer; show filename, line on top of mutation
mutation viewer, implement html/css for showing mutants detail
mutation viewer, use webview for mutation detail panel