Merge branch 'feature_stitch_nonlinear' of https://github.com/quetric/finn into quetric-feature_stitch_nonlinear

Added external weights option to StreamingFCLayer

Added explicit naming of HDL interfaces, for use during ip stitching

Modified docker-related scripts to enable Vitis in the container

Feature/add quant av pool hls support

Feature/absorb consecutive transposes

Feature/absorb transpose into mt only linear

Feature/fix Labelselect folding and optimize output

1000 labels with low folding creates very large, long-running test cases

Feature/merge models

[Transform] Restructure MergeONNXModels to correctly preserve quantization information of non value_info tensors