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

Improve 'GraphView::replace()' for cases where removed operator had multiple outputs also in the GraphView

byding the first tiling prototype

See merge request !58

GraphView inputs/outputs ordering

See merge request !53

Merge branch 'graphview_io_ordering' of gitlab.eclipse.org:eclipse/aidge/aidge_core into graphview_io_ordering