support cmd2 >= 2.0.0
cmd2 unfortunately had a number of API breaking changes in recent years. We're still stuck with < 2.0.0 (meaning 1.5) while upstream is at 2.4.0
I tried to port pysim to 2.4.0 in the
laforge/cmd2_2.4 branch - but somehow the tab completion / history seems completely broken.
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