* [Refactor] use getCustomOp instead of direct registry access

* [Refactor] move HLSCustomOp base to own file

* [Refactor] register all HLSCustomOps in new style

* [Refactor] use correct domain for custom ops acc. to new style

* [Deps] update finn-base to get new-style customop domains

* [Refactor] more domain fixes

* [Test] fix ipstitch expected io values in rtlsim

* [Deps] update finn-base and brevitas

* [Docs] link to CustomOp reorg PR

* [CustomOp] groundwork for decoupled Thresholding op

* [Thresholding] more decoupled mode preparation

- new attributes for "weight" (really threshold) datatype + n_steps
- move thres datatype into acc minimization function and call in convert_to_hls
- other helper functions

* [Refactor] add make_weight_file for Thresholding layer + wire up

* [Threshold] first attempt at Thresholding_Stream_Batch

* [Threshold] wire up more decoupled functionality, add test

test does not yet pass for multi-PE

* [Threshold] use 2 layers of slicers, all decoupled cppsim passes now

* [Threshold] more decoupled fixes, most rtlsim tests pass

* [Threshold] add unroll to decoupled thresholding, remove unused vars

* [ConvertToHLS] allow specifying mem_mode in InferThresholdingLayer

* [Threshold] expose interfaces for runtime weight writing

* [Test] add runtime threshold test

not yet passing

* [Threshold] use std::less_equal also for decoupled

* [Threshold] use flipped PE axis for decoupled-more rtl thresholds

* [Test] runtime threshold reading works

* [Test] runtime writable thresholds test working

* [ConvertToHLS] fix threshold shape

* [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

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

no rtlsim implementation for impl_style=vivado right now