[CircleEditor] Refactoring structure and codes

[llFreetimell]

What?

Let's refactor overall structure and source codes for CircleEditor.

Why?

• To improve performance
• To improve static analysis score
• To improve readability and maintainability
  • Remove source codes which are not related with editing circle file
  • Rename variable and functions
• To fix bugs

Draft

• [DRAFT][CircleEditor] Refactoring structure and codes #1454

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TODO Items

• Minimize duplicated source codes
  • Reposition external source codes
  • Remove not modified source codes from our own codes
• Remove source codes which are not related with editing circle file
• Rename variable and functions which have unclear names
• Improve performance
  • Substitute opening a file with rendering graph after editing
  • Do not change when before and after are same
• Clean codes
  • Separate value validation function when save
• Fix bugs
  • Edit custom attribute --> Ctrl+z --> arrows are dismissed
  • BCQ(maybe some other operations too) attribute types are null
  • Custom options only supports few types
  • Even invalid attribute values are given, changes are generated

[llFreetimell]

Feature Requests

• When duplicated keys for custom option are given, alert
• Represent shape_signature