Add "autoX", "autoY", or "auto" to fInputConnectableSide and fOutputConnectableSide.

[R3zu3]

• "autoX" determines the closest horizontal connection side by considering both the position and the width of each element (fNodeInput and fNodeOutput).
• "autoY" determines the closest vertical connection side by considering both the position and the height of each element (fNodeInput and fNodeOutput).
• "auto" selects the best connection side automatically, taking into account both horizontal (autoX) and vertical (autoY) proximity based on the position and dimensions of the elements.

This allows connections to be dynamically positioned for optimal alignment.