fix merge dsn session to have SVG parity #69
Merged
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The main idea behind this work is to make sure that converting Circuit JSON to DsnPcb AND DsnSession can successfully be converted BACK into an identical-looking Circuit JSON. We can use this test to make sure the ids stay consistent!!!
Prior to this test and the last two PRs, the dsn-converter could not convert Circuit JSON to DsnPcb and DsnSession then back again without changing the circuit. Something was always lost or changed, e.g. missing vias or flipped traces
This type of test can be written for other examples to make sure we can successfully convert things back and forth, for example it could be used to "recreate" oval shaped holes or multi-layer traces (traces with inner layers) etc.