Compatibility mod that tweaks Vehicles

1. Spiderbots - adds a MK2 (prototype) version of the Spiderbots
   asher_sky has coded some amazing script behind the Spiderbots and further impressed me with what they have done in 2.0.
   This tweak mod adds a MK2 Prototype version that is slightly larger, has inventory space and equipment grid.
   Also as it's only a prototype, it does not have the software of the original Spiderbots and acts more like a small weaponless Spidertron.
   For use with my other mods Neural Spidertron Control and Orbital Vehicle Delivery.

2. AAI Vehicles: Miner - the Mining Vehicle MK5 exceeded the 1 ton weight limit - the vehicle can now be sent to orbit

3. Hovercrafts - Missile Hovercraft exceeded the 1 ton weight limit - the vehicle can now be sent to orbit