Update fuseBatchNorm to include ConvDepthWise and MetaOperators

See merge request !62

Add Convert operator (a.k.a. Transmitter)

See merge request !57

Update fuseBatchNorm to include ConvDepthWise and MetaOperator containing Conv or ConvDepthWise as an output

Improvements and fixes

See merge request !59

Vit operators

See merge request !47

Change 'int32_t' for 'size_t' as this type is widly used in the whole framework and is made to repesent dimensions

# Conflicts:
#   include/aidge/operator/Slice.hpp
#   src/operator/Slice.cpp