Final Bricks / Data Integration

We've added some more stuff to the whole Data Topic.

Could someone please give us some Feedback on what we've done so far? Just in case we are making horrible mistakes :)

Fully Working - Stuff to Review:
- new Bricks (Input, Counter, Dropdown, Submit)
- Communication between Bricks for later Submission to Firebase
Add all variables under a section to `variables.less`. We do this because all variables in Less are globals and unintended conflicts can occur otherwise