LevelMeshTool.cs

using UnityEngine;
using UnityEditor;

public abstract class LevelMeshTool
{
    public abstract string IconPath { get; }
    public abstract string ToolName { get; }
    public GUIContent Content { get; set; }
    public Texture2D IconTexture { get; set; }
    
    public abstract void Act(LevelMeshEditor editorState, Event current);
    
    public LevelMeshTool()
    {
        IconTexture = AssetDatabase.LoadAssetAtPath<Texture2D>(IconPath);
        Content = new GUIContent(IconTexture);
    }
}