Small Fix for Randomized Positions

I have patched the game with a small fix to avoid that characters/items would overlap too closely on the horizontal axis when they are randomly positioned.

Previously, there was a small but dangerous chance that characters/items would spawn in clusters so close to one another that they could overlap too much -- making it too difficult or outright impossible to see or click on certain characters/items properly. It would have been possible, for example, that the item "Stone of Second Sight", being fairly small, could spawn directly behind a nymph, and if that nymph were in a "sitting" pose, the item behind her would be obscured and impossible to click on.

So I added a safety-measure, letting each character/item spawn in a grid of 20 pixels distance per x-position, while the y-positioning is still entirely free (x-positioning only reverts back to the old method of entirely random choices if for some reason no spot on the grid can be found, but this is unlikely). The fix is not perfect, but it works. It still allows for clusters with close proximity too, but even then the items/characters are now horizontally spread apart far enough that none of them is ever in another one's way.