Remove PPos hacks from RadarWidget.
Remove unnecessary int2 -> PPos -> int2 conversions.
Remove PPos and tidy DebugOverlay.
Render minefield targeting using PBOG-style overlay.
Replace CenterLocationInit -> CenterPositionInit.
Add WorldRenderer.Position for screen -> world conversion.
Remove PPos hacks from WorldInteractionController.
Fix radar cursor fake mouse event location.
Remove PPos from TeslaZapRenderable.
Remove PPos from GainsExperience.
Use SpriteRenderables for tile overlays.
Use SpriteRenderables for selection decorations.
Remove Sprite.DrawAt.
Convert Sound to world coordinates.
Remove PPos hack from ScreenShaker.
Remove PVecInt from Viewport.
Remove PPos and PVecInt.
Fix some style nits in WorldRenderer.
Fix double-rendering regression.
Merge pull request #3886 from pchote/ppos-cleanup

Remove legacy PPos type.