Refactor EditorWindow UI and response handling

[AussieScorcher]

Significant modifications to EditorWindow.Designer.cs:

• Renamed and added multiple UI components (InsetPanel, TextLabel, GenericButton).
• Replaced old components with new ones (insetPanel_0 to insetPanel_4, lbl_response_0 to lbl_response_4, btn_messageScroller_0 to btn_messageScroller_4).
• Adjusted form properties (ClientSize, MinimumSize, Anchor properties).
• Updated SuspendLayout and ResumeLayout calls.
• Set Resizeable to false and SizeGripStyle to Hide.
• Updated form Text property to "ACARS Editor".

Refactored response handling:

• Changed responseIndex to an instance variable.
• Added new instance variables for managing multiple response labels and buttons.
• Added initialization methods for scroller buttons and response labels.
• Replaced lbl_response and btn_messageScroller with new instance variables.
• Added ClearResponses, UpdateScrollerButton, UpdateResponselabels, UpdateScroll, and UpdateResponseText methods.
• Updated event handlers and methods to support new instance variables and multiple response labels/buttons.