Removed weapon mouns snapping

Weapon mounts would get snapped to old position should they end up
outside of visible area due to some operation; removed that
functionality since it's annoying and now obsolete with the undo/redo.
Modified anchor position checking

Changed anchor so that it checks low bounds (left and top edges of
visible area) later - this way the anchor's box won't get placed outside
of visible area due to moving it when the editor's window is smal
enough.
Item dropdown lists - alphabetical sorting

Modified item (augment, weapon, drone) dropdown lists in Ship
Properties, so that they are now ordered alphabetically, and added
spacing between the item's name and blueprint name.