Improve import pass

[jsn1993]

I remove the connections and mangled_ports in sv import pass. As a by-product, I was actually able to drastically simplify yosys import pass. Now it overrides only the "mangling scheme" part of the general SV import pass .

[codecov[bot]]

Codecov Report

Merging #145 into master will increase coverage by 0.06%. The diff coverage is 94.37%.

@@            Coverage Diff             @@
##           master     #145      +/-   ##
==========================================
+ Coverage   90.36%   90.42%   +0.06%     
==========================================
  Files         278      277       -1     
  Lines       24005    23745     -260     
==========================================
- Hits        21692    21472     -220     
+ Misses       2313     2273      -40

Impacted Files	Coverage Δ
...ackends/sverilog/import_/test/SVNameMangle_test.py	100% <ø> (ø)	:arrow_up:
...kends/sverilog/import_/test/ImportedObject_test.py	100% <ø> (ø)	:arrow_up:
pymtl3/passes/backends/yosys/import_/ImportPass.py	97.91% <100%> (+25.35%)	:arrow_up:
...ds/sverilog/import_/test/SVImportSignalGen_test.py	100% <100%> (ø)	:arrow_up:
...mtl3/passes/tracing/test/VcdGenerationPass_test.py	97.87% <100%> (ø)	:arrow_up:
...s/backends/sverilog/translation/TranslationPass.py	100% <100%> (ø)	:arrow_up:
pymtl3/datatypes/bitstructs.py	97.72% <100%> (-0.21%)	:arrow_down:
pymtl3/passes/backends/sverilog/util/utility.py	86.48% <100%> (ø)	:arrow_up:
...sses/backends/yosys/translation/TranslationPass.py	100% <100%> (ø)	:arrow_up:
...mtl3/passes/backends/sverilog/util/test_utility.py	80.16% <42.85%> (ø)	:arrow_up:
... and 3 more

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