Feature - Implement TabControl Data Model & Save Logic #9

Title:
Feature: Implement TabControl class and SAGE engine properties

Description:
We need to support the TabControl UI element based on the original SAGE engine C++ source code . Unlike standard User controls, a Tab Control handles an array of sub-panes and specific layout orientations.

Tasks:

• Create a new TabControl class inheriting from UserControl (or Window).
• Inject specific default properties into the initialization:
  • TABORIENTATION (default: 'TOPLEFT')
  • TABWIDTH and TABHEIGHT
  • NUMTABS (default: 1)
• Create a TABS array property capable of holding up to 8 tab dictionaries. Each dictionary must contain: NAME (label), SUBPANE (associated window name), and DISABLED (boolean).
• Update the textures dictionary to include exactly 3 slots for ENABLEDDRAWDATA: Background, Active Tab, Inactive Tab.
• Update the saving logic to ensure TABORIENTATION is written to the file before the TABS list.

Acceptance Criteria:

• TabControl object generates the correct Python dictionary structure.
• All specific Tab properties exist in the Property Editor.
• Exporting to .wnd generates the syntax exactly as the game engine expects it (strict order of properties).