Everywhere: Changes to @html_dom_node and TrueType API

CSS properties fontFamily and fontSize are part of @html_dom_node now,
and the TrueType API only accepts I32 code point streams, so we have
to preprocess UTF-8 streams before rendering text.

System/Libraries/Html/Tokenizer.HC

@@ -95,7 +95,7 @@ class @html_dom_node : JsonElement
     U32 backgroundColor;
     U32 color;
     U8* fontFamily;
-    I64 font_size;
+    I64 fontSize;
     Bool display_block;
 };