Remove unecessary DOM elements in the lib

[kalwalt]

Removing DOM code

My initial idea was to make the code node.js compliant as said in #128 but it's not as simple as removing only DOM code. There are other part that the code fails to load in a node environment. I will do in another PR, i prefer to make by little steps.

Tasks done

• removed canvas, cts, image, orientation properties from artoolkitNFT.api.js and ARControllerNFT.ts
• fixed qunit test

[kalwalt]

CI test fails because i removed canvas, ctx and other properties from ARControllerNFT. i will fix the test.js code.