lua minigame for micrometeorites point defense

[aBlueShadow]

This is some plugin style lua script that provides an extremly simple "minigame" for the weapons console.

It is basically an attempt to keep weapons on their toes outside of combat or scripted events.
Every now and then, a micrometeorite is detected, and weapons has a short time windows to shoot it down by pressing the right button.
In can be en- and disabled per player ship. With shields on, it is always inactive, as this is a rough indicator of being in combat. In game, this could be explained by stating that micrometeorites are just absorbed by the shield.
It is also inactive when no weapons officer is present, as tactical and single pilot are busy enough.

I am not quite sure about the actual utility of this, but I figured publishing I might be useful anyways, at the very least as an example of modularization for scenario writers, so one might be encouraged to outsource systems so that they can be reused in other scenarios.
Shoutout to @hemmond, looking into the custom elements wrapper helped me a lot with OOP-izing the minigame.

I also added translation tags, although I am not sure if utility scripts are translatable at all. But as those tags did no harm either, I added them anyway

[aBlueShadow]

As I successfully tested that the language tags do work indeed, I added a german .po file as well

[aBlueShadow]

Some changes:

• Small fixes like the removal of debug messages.
• Lowered the volume so the beam sound is more subtle.
• Unicode characters are outside of the translation strings now, as those seemed to cause problems.
• Convenient updateAll() function, so you won't need to manually update for any ship with point defense.