Update ace-rails-ap to 4.1.x
ace-rails-ap 4.1.x is available which allows file modes (Ruby, YAML, JSON etc) to be loaded via the asset pipeline instead of being included into application.js. This will reduce the size of the app file and in most cases, not load code that's only needed when switching file modes (rarely).
fixes #15829 - remove ace-rails-ap file modes from app.js
Also removes editor from precompilation list, it's in the main app.js
since fa8353d, and removes unused ACE extensions.
application.js has reduced from 2512 to 2381KiB.