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Results 4 issues of asdfCYBER

Fix #167 by making the API class public

The external API class in [src/ExternalAPI/API.cs](https://github.com/GER-Space/Kerbal-Konstructs/blob/master/src/ExternalAPI/API.cs) is private, but it should be public for it to be able to function as intended.

Somehow the Firefox console screws up the newline: ![afbeelding](https://user-images.githubusercontent.com/33639328/41812907-260ab2bc-772c-11e8-9a91-54d760fb63d4.png) When copied and pasted to notepad it works fine.

bug
wontfix
low-priority

Yes, I reuploaded things multiple times and there are too many commits. Please don't blame me, I never use GitHub.