Implemented modular mines

- Rebalanced missile modules, removing most of their downsides
- Payload module now has diminising returns but also slightly increases explosion radius

- The 4 major missile stats are now all visible
- Experimental fix for missiles getting deleted on save and reload

- Added EMP missile stats to tooltip

- New EMP missiles mode for modular missile launcher.
- Add sprites for modular missile segments and launchers when they are not connected to a loader.
- Some under-the-hood improvements to make the mod run better and easier to maintain.

- Fixed a crash related to missing localization keys in keybinding screen.
- Lower-bounded missile range, acceleration, and turn rate at 10% of base value.

First Version