Update 3.1.3

New bug fix update. (3.1.3) This update fixes some immediate issues found in the previous versions and other fixes and polish.

• Fixed a longstanding issue where IntGrid tile colliders would scale incorrectly if the physics sprite's pixels per unit were different from the importer's pixels per unit
• Fixed an occasional exception when exiting from an importer inspector
• Fixed an exception when trying to draw gizmos when the scene view is null
• Minor edit in the project/level artifact's TreeView to not show '0' values
• Improved the color of importer-related logs and for light theme
• Improved the renaming experience when generating IntGrid tile assets
• Improved samples to be smoother in play mode