Remove star imports

Remove the following:
`from tkinter import *`
`from time import *`

Star imports are not allowed in PEP-8 guidelines. So, import the modules with a name and add it wherever they are being used.

*Example:*
`import tkinter as tk`
<..some code..>
`tk.Button()`

Search the repository for `from tkinter import *` and `from time import *` to locate the affected code and inspect each usage. Replace the star imports with named module imports and update references consistently; done means no star imports remain and the game still works.

索引モデルが issue の本文から書いたものです。