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Output log to a Wide LCD panel

Use class ScrollTextDisplay to new a instance.
For display logs, we need a Wide LCD Panel working with the programable block.
ATTENTION: All the blocks' owner should be "Me".

When calling the constructor of class ScrollTextDisplay, give the maxLineCount (if exceed, screen will scroll up) and a Wide LCD Panel object.

Default value of maxLineCount is 18.

if a null is given for the lcd panel object, scirpt will try to find the first text panel object in current grid system.

Content scorlled out will be lost forever , save them yourself if needed.

The println method will output a line of string to the target lcd panel.
The log method will add a timestamp before the line of string which will be send to println.