Refactor display settings builders

[kunerd]

remove closures in .set_* methods, by using either:

• the builders directly via reference: .set_entry_mode(EntryModeBuilder::default().set_move_direction(...))
• a public struct: https://play.rust-lang.org/?gist=5555953cc7b2421c281b65adb1fb9d45&version=stable
• an enum for all settings:

  display.set(Function::EntryMode{...})
  display.set(Function::DisplayControl{...})