Fix file mode and whitespace errors

[friederbluemle]

A bunch of non-executable files in the repo erroneously had the executable bit set. This fixes it by changing the file mode from 755 to 644.

It also fixes all whitespace errors in this repo - e.g. missing newline at EOF, trailing whitespace.

[emin93]

The RN TypeScript template is based on the default RN template (https://github.com/facebook/react-native/tree/v0.61.5/template) and aims to be as consistent as possible with it. It seems that the issue persists there as well, so I'd suggest you to create a PR in the RN repo and then we merge it over here.

[friederbluemle]

Thanks for your reply @emin93 - The main React Native template does not contain trailing whitespace errors (or incorrectly set file modes). If you think otherwise, can you please point me to the specific files you're referring to? Thank you!

[emin93]

Welp, I relied too much on the GitHub editor/viewer which seems to not render EOF newlines 😅. I just downloaded the default template and realized they do indeed have EOF newlines. Therefore I apologize.

[friederbluemle]

Haha, no worries, thanks @emin93 👍
Have a nice weekend!