Exception thrown when loading maps containing objects with decimal values for x,y coordinates

[Josh1billion]

Found a new case where a bug can arise.

In ObjectGroup.cs, on lines 68-69, these lines can sometimes throw unhandled exceptions, crashing the program:

            X = (int)xObject.Attribute("x");
            Y = (int)xObject.Attribute("y");

Specifically, this happens if the x and/or y values for an object are decimal values.

Steps to reproduce:

1. Create a new map in Tiled.
2. Create an object layer.
3. Create an object, and set its X or Y value (under Position) to a decimal value, such as 100.5
4. Try loading the map in TiledSharp.

This might seem like a rare case ("who would enter a decimal value for an x or y coordinate, anyway?"), but in my case, Tiled actually set it to a decimal value automatically as I was dragging-and-dropping an object around in the editor, so it's entirely possible that users will run into this at some point after messing around in Tiled long enough, like I did. :)

[Josh1billion]

The same also happens with Width and Height on lines 71-72, by the way.

[marshallward]

It looks like libtiled converts these to integers (as in map reader.cpp:readObjectGroup), so it's definitely a good idea to do the same here. Thanks for the report!

[marshallward]

Oops, my mistake. I was reading the (deprecated) object group attributes. The individual object attributes are indeed floats, so this is an error in TiledSharp.

Replacing (int) with (float) should be all that's needed.

[marshallward]

I've updated the master branch to handle object float attributes. Could you give it a try?

[Josh1billion]

Works great! Thanks for fixing it so quickly.