[test_move_identical_op_past_join_op]: added test case for new transformation.

* Add MoveMulPastMaxPool transform to streamlining

* Add second call to transformation within streamlining

* [Deps] update finn-base

* [Refactor] fix im2col props for updated finn-base

* [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

called prior to transformations now by default

thanks to @quetric for pointing this out