scenario editor: add triggers, conditions and effects

Description

The UI features a structured layout intended for managing scenario triggers and effects.

1. Scenario Triggers Section:

   • Label: "Scenario Triggers" prominently at the top, indicating the section's purpose.
   • Trigger Display: The current trigger (e.g., "Trigger 0") appears in a textbox but lacks detail, suggesting a space for user input or selection.
   • Buttons: Four action buttons include "New," "Copy," "Info," and "Delete" on the left, each with a distinct red surround, providing clear, individual functionality for managing triggers.

2. Conditions & Effects Section:

   • Label: This section is labeled to specify it deals with event conditions and their effects.
   • Conditions & Effects List: A list area displays current conditions (e.g., "Capture Object") and effects (e.g., "Train Unit"), indicating user-defined actions.
   • Additional Buttons: Similar to the triggers section, it features buttons for "New Cond," "New Effect," "Copy," and "Delete," ensuring users can manage conditions and effects conveniently.

The interface balances a simple and clear presentation with functional buttons to facilitate user interaction in scenario creation or editing.