[text] Add line-break support to DrawText()

[raysan5]

When drawing text, it will be very useful to be able to add line-breaks \n.

Related functions [text.c]:

void DrawTextEx(SpriteFont spriteFont, const char *text, Vector2 position, int fontSize, int spacing, Color tint);

Just add a font-size-proportional Y-position increment and reset X-position value when character \n is parsed.

[raysan5]

Added feature on commit f13b30d

[differenceclouds]

It seems the line-height is 1.5 times the font size. Maybe it would be nice to be able to change this?

[raysan5]

I'm already looking for the best approach...