Partly merge the 'iap' branch.
Progress with Win effect + stars
Disable writing DEPTH and STENCIL to the Screen from both the TwistyObjectNode and the Overlay Node.
Star visible now, but the background of it is opaque (dark gray, same as the glClearColor of the main Screen)
Beginnings of support for 'Overlays': first overlay will be the rotating star which little stars fly to when one solves a level for the first time.
Progress with marking objects as free.
Progress with marking objects as free
IAP: speed up.
IAP: finish the 'Purschase' activity.
IAP part 6: new 'Present' object effect (cont'd)
IAP part 6: new 'Present' object effect.
IAP part 5: new 'Purchase' activity (cont'd)
IAP part 5: new 'Purchase' activity.
IAP part 4: further progress with locks in the object popup screen.
bugfix
IAP, part 3: non-free objects appear in the popup with a lock icon: make the lock icon's size resolution-independent
IAP, part 3: non-free objects appear in the popup with a lock icon.
IAP, part 2: unify the way we create object popups in ScreenPlay and ConfigActivity.
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