use_crossbars option for ACE

My earlier excitement over cutting the ACE crossbar simulator stemmed from local hardware instability; there is still at least a modest performance improvement with the crossbars. However, this is a significant tradeoff for scalability concerns (though the crossbars simulator could always fall back to underlying "vanilla" ACE in the C++ Qrack library to maintain scalability), so we offer the option to turn crossbars on-or-off, enabled by default. (This is probably the appropriate default for most single-GPU systems.)

Full Changelog: v2.26.6...v2.27.0

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