Don't round camera position on sync

[xastor]

I have a 2D game where the camera continually moves around, and the fact that the camera rounds its position leads to stuttering.
This change fixes the issue for me, but I also think it is good default behavior to have sub-pixel precision on the camera by default. Maybe I am wrong though? Maybe making this configurable would be better?

[Yanrishatum]

Iirc that rounding was added in order to avoid pixel bleeding during rendering, but it's been 4 years and I don't remember exactly. I would say gate it behind heaps_h2d_enable_camera_rounding / heaps_h2d_enable_camera_rounding define, depending on which default behavior is preferable for Shiro.

[xastor]

Is this fine for merge? We could also check for heaps_h2d_enable_camera_rounding!=false to have the default behaviour (without a define) to not round.

[rcstuber]

1. Why introduce a new define if it can be done with a property of Camera?
2. Default should be what it was until now (rounded) or else bugs will pop up in legacy code

[xastor]

I have made adjustments. Would this be suitable for merge?

[xastor]

Removed duplicate code.