* [StreamingFC] introduce make_weight_file helper function

not yet wired into the rest of the class

* [Test] use make_weight_file helper in runtime weight test

* [Test] make runtime weight test work with different aspect ratio

* [Refactor] StreamingFC: use make_weight_file in generate_params

Improve throughput of Data width converter

Enable and test writable weights in decoupled mode

some discrepancies between vivado and HLS here so sometimes AXI
lite signals appear as e.g. ifname_AREADY whereas other times it
is ifname_aready

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

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

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

AXI lite utils for PyVerilator

Automatically discover the correct depth of FIFOs in the dataflow