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Added files and functions required for FLARE21 code.

Update readme

add heatmap target generation with covariance matrix for 2D and TF1

Merge branch 'master' of https://github.com/christianpayer/MedicalDataAugmentationTool

fix bug in RandomFactorInput transformation, thanks @skrishnanv

Merge pull request #18 from nlessmann/master

Fix coordinate rescaling to work with list objects

add support for using tf2 in tensorflow_train module

add json datasource to load json files containing dictionaries

fix bug where nodes could be evaluated twice in run_graph

fix bug in landmark_visualization, where annotations are not visualized

greatly increase speed of robust_min_max

refactor landmark_visualization to have an easier to use interface and support 2D

fix resample_to_spacing to also work for 2D images