Game update

SST v0.9.4.2 - Undo, Recovery Mode, Active tools icons

Space Simulation Toolkit - DEMO · published 2 Mar 2026, 22:58 UTC

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- Undo (Ctrl+Z)
- Recovery mode on crash
- Active icons on tools menu
- one step only Undo in first version
- 1/2 of GPU memory reserved for Undo
- red mark for too big savefiles on Load

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