add(Scrollable): init function with corresponding usages

src/style.zig

@@ -44,6 +44,8 @@ pub fn eql(this: Style, other: Style) bool {
     return std.meta.eql(this, other);
 }
 
+// TODO might be useful to use the std.ascii stuff!
+
 pub fn value(this: Style, writer: anytype, cp: u21) !void {
     var buffer: [4]u8 = undefined;
     const bytes = try std.unicode.utf8Encode(cp, &buffer);