Refinement of sliding controller

[pattacini]

Hi @ipa-bfb @svestark

Please consider these modifications that:

• make the fingers calibration account for the hand version 2.0;
• comment out the tweak of the elbow (in wysiwyd the Reactable was much higher);
• apply some cleanup;
• make some dependencies more explicit.

[bmagyar]

Thanks @pattacini ! Can we offer you a blue wristband? ;)

[pattacini]

My pleasure @bmagyar Eheh, I've got one wristband of each color but I cannot wear one to pretend to remain unbiased 😜