Nmc/2047 Fab theming

[surinder-tsys]

Customized floating action button.

• Tests written, or not not needed

[tobiasKaminsky]

Hm. This approach works, but is error prone for future.
E.g. you already now overlooked DocumentScanActivity:94, where it is also being called.

I tried to overload the function, but did not succeed.

[surinder-tsys]

Hm. This approach works, but is error prone for future. E.g. you already now overlooked DocumentScanActivity:94, where it is also being called.

I tried to overload the function, but did not succeed.

We won't be using NC scan functionality in our app as we have our own. That's why I didn't made any changes in that file.

[surinder-tsys]

This PR code has been moved to #106 to optimize PRs.