Clean up code for macro display widget

[KonaeAkira]

Changes:

• Use Ui::indent instead of implementing our own indent.
• Move scroll reset logic to MultilineMonospace:
  • The scroll should reset whenever the text changes instead of only when the actions change.
  • Remove the old workaround of guessing the id of the ScrollArea and deleting its state.
• Move macro-formatting logic to a single function that is more easily testable:

  fn create_macros(config: &MacroViewConfig, actions: &[Action]) -> Vec<String> {
    todo!();
  }

• Write aforementioned tests.

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