v0.7.0

• Draggable history-marker bar: drag the marker (the silver line with the grip on the right, between the active and rolled-back items) onto a row to roll the marker there, SolidWorks-style.
• New Toggle Translucency context-menu item makes a feature's bodies 50% translucent (and back), like Fusion's Opacity Control.
• Fully constrained sketches now show Fusion's own lock-badge sketch icon.
• Fixed the sheet-metal component icon (it had been showing the generic placeholder); the add-in can now load Fusion's SVG-only icons too.