Reference for unit 'Crt': Procedures and functions

`AssignCrt`		Assign file to CRT.
`ClrEol`		Clear from cursor position till end of line.
`ClrScr`		Clear current window.
`cursorbig`		Show big cursor
`cursoroff`		Hide cursor
`cursoron`		Display cursor
`Delay`		Delay program execution.
`DelLine`		Delete line at cursor position.
`GotoXY`		Set cursor position on screen.
`HighVideo`		Switch to highlighted text mode
`InsLine`		Insert an empty line at cursor position
`KeyPressed`		Check if there is a keypress in the keybuffer
`LowVideo`		Switch to low intensity colors.
`NormVideo`		Return to normal (startup) modus
`NoSound`		Stop system speaker
`ReadKey`		Read key from keybuffer
`Sound`		Sound system speaker
`TextBackground`		Set text background
`TextColor`		Set text color
`TextMode`		Set screen mode.
`WhereX`		Return X (horizontal) cursor position
`WhereY`		Return Y (vertical) cursor position
`Window`		Create new window on screen.