display the file name in the window title

glsl/files.js

document.title = ".edit";
document.body.innerHTML = "";
var files = {};
files.prefix = "/papill0n.org/shaders/";
files.makeName = function(name) {
  return `${name} - shaders!`;
}
files.current = "spec.txt";
files.builtin = {"spec.txt": `# Spec
files.open = function(name) {
  files.current = name;
  document.title = files.makeName(name);
  if (name in files.builtin) {
    files.currentFile = {"name": name, "content": files.builtin[name], "readonly": true};
  } else {
  if (files.exists(name)) { throw new Error("already exists"); }
  
  files.current = name;
  document.title = files.makeName(name);
  
  files.currentFile = { "name": name, "content": content, readonly: false };
  localStorage[files.prefix + name] = content;