Enable SplashFontRenderer render Unicode char

[Ecdcaeb]

Enable SplashFontRenderer render Unicode char Open SplashFontRenderer for modder as a early font renderer.

Some mods might render text at loading splash or any other early usages.

Why do I encounter this problem

I noticed that LoadingTips is using SplashFontRenderer, which does not support UTF-8 chars. However, it is not a issue of LoadingTips. Cleanroom should allow the using of UTF-8 chars in the splash rendering, although forge does haven't any non-ascii chars to render. Early character rendering is a very common requirement.