Add a cvar to control the font size used in hud_notify (note: Still relative, not...

Add a cvar to control the font size used in hud_notify (note: Still relative, not in pixels.. could maybe be adjusted later) - this is so that text isn't always cut off all the time with the notify panel, as usually you can barely see a name when it's cut off with its giant text. 1.0 is original size, 0.8 is proposed size. Personally i'm going to use 0.5 though.