Allow line breaks in messages

[ClementSparrow]

Currently, if you want to make a message that is left-aligned rather than centered, or paragraphs in a message (and thus, lines that should stop at the end of the paragraph), or blank lines, it becomes a nightmare to find where to add spaces in the message so that the automatic centering function breaks the lines where you want. And some things are impossible without adding visible characters (e.g., a line break in the first line).

So I propose we can place manual line breaks in messages. The simplest way to do this would be to have a character that represents a line breaks and can be escaped, but it may break existing games. Other ways may be safer, but need to deal with the parser and I don't want to.