Refactoring: Extract class "NoteJudger"
Wirte tests for class "NoteCondition"

Performance improvements: SetSelect solves the problem of overloading the program by creating too many note objects in the scene. However, some overloading occurs when creating note objects of selected set in InGame scene.

Corrected the cause of malfunction in scene other than game: Concat () is a Linq method, so it returns the result of performing the action.

This reverts commit 51779acb.