feat(#66): draw multiple circles

[janscheidegger]

Create Interface for drawables
Abstract x/y to point
Drawables know how to draw themselfes
Save currently Drawing element at last position in array and change on move
Clear Canvas and draw whole array at once

[janscheidegger]

Tested Remote Part and draw-webcomponent seems ok to me. Would be cool if someone else could take a look and provide some feedback. I will adjust the code then if necessary.

I have the feeling that drawing is a little bit off, meaning the line does not exactly appear where my finger is. But it is the same in the current version.

With this change we are now easily able to implement new forms and colors.

[peterpeterparker]

I tested the remote part in the demo kit, looks good to me too 👍

About "a little bit off" agree it's already the case, I hope that this will be improved and fixed once I'm done with the rework of the UX of the remote (#228) as the aspect ratio of the deck will change

[peterpeterparker]

I tested the remote control app part too, it's all good, thx for the cool PR and awesome work 👍