move failing test into "todo" folder so that it can be excluded with ctest -E '^todo/'
test case that spawns 2000 mines in a pit. run with ctest -R mines # only works if cmake was ran after pulling this commit
fix for
issue #828: Manual placement animation is drawn twice
Lua API:
onSpritePlacement(spriteId, centerX, centerY)
onGirderPlacement(frameIdx, centerX, centerY)
onRubberPlacement(frameIdx, centerX, centerY)