Accidentally edge scrolling

[GIS-PuppetMaster]

When the mouse is accidentally placed on the edge scrolling position while hanging up for simulation, the camera will be too far away from the city and unable to return.

[algernon-A]

Version 1.0.1 introduces a hard limit to stop this happening. Camera scrolling will now be limited to twice the width of the full map (eight times the width of the playable area).