Stacking Cargo Container 1.4

Changed ship core position (yes, again...) to reduce ship clipping when exiting. Reduced mass very slightly, increased capacity to 18 storage modules. This is the most I can fit into the current design. This *should* be the last update for a while.

Removed more needless blocks, made room for more extension, now holds 16 storage blocks, 12.3 mass.

Updated the container with a rear-facing core to see better while docking. Now holds 14 storage instead of 12. Removed unused blocks to make it slightly lighter (12.5 mass). Now comes in blue (because that's what I needed).