More colors ...

I have uploaded a new disk image with some minor changes. This is still far from the complete program. I should implement the configuration menu next. 

Changes:

- You can use "T" in the main menu to change text color (global setting)

- You can use "B" in the main menu to change border color (global setting)

- You can use "G" in the main menu to change the background color (global setting)

- Other minor changes