Improved Ship System

Extend the Ship System to allow different Ship types.

- [ ] Heavy Ship (more armour, slower turning circle, can house more powerful weapons, but fire slower)
- [ ] Medium Ship (maybe what we have now, but a little better)
- [ ] Light Ship (less armour, more manoeuvrable, faster firing weapons)

Start by locating the existing Ship System and current ship implementation in the MonoGame project. Review how armour, turning, weapons, and firing rates are represented before determining the scope for Heavy, Medium, and Light ships. Done should mean the three listed ship types are implemented with their distinct characteristics.

Written by the indexing model from the issue text.