Gesticulator: BVH files from the ablation study

BVH files corresponding to the motions for the full model and all 6 different ablations, which were used in the ablation study for the ICMI 2020 paper "Gesticulator: A framework for semantically-aware speech-driven gesture generation"<br>Note that we discovered an issue with the velocity loss implementation used for our experiments. The bug was fixed in this commit. The experimental results involving velocity loss were hence not correct and should be disregarded.