motor current when stopped = 0

Ripped out parts that will never work

Loading a second time shall now apply the battery capacity increase

Type VII speed reduced to match expected top speed.
Type VII speed orders now based on real life data.
Electric drive currents now based real life data.
Old battery model capacity temporarily increased before new battery is added, to support the new drive current figures.

Removed multi line description from the manifest, this broke the mod for some reason.

Added ammeter

The U-boat can now get to places it normally would thanks to weird and unnatural fuel calculations