Messages in serial monitor can be cut-off when they are too long

[chillibasket]

If the messages sent/received in the serial monitor are longer than the width of the window, they are cut-off. Since there is no horizontal scroll option, it is not possible to see this text.

Possible solutions are:

Adding horizontal scroll in the serial monitor
[Or] Wrap the text down to a new line if it exceeds the window width

[chillibasket]

In commit fea90bd I half-fixed this issue:

• Instead of hiding all text when the message is too long, the serial monitor now shows as many characters as can fit in one line.
• If the text is longer than what can be shown in the window, the ">>" icon is shown on the right hand side to indicate that some text is hidden.
• However, there is no way to see that hidden text yet other than resizing the entire window.