Improved TrySeparate()

TrySeparate() with a tolerance parameter has been improved, to avoid unnecessary entanglement when called in QUnit. As Decompose() also turns out to be a unitary operation in general, Separate() in the shared library API also no longer proactively normalizes its output subsystems.

Sparse state vector simulation was found to be bugged (under QUnit), and the official recommendation is that QBDD (QBdt) supersedes it in basically all regards, so sparse state vector simulation has been removed. (The argument to enable it remains behind in QInterface constructors so that this need not be a breaking change.)

What's Changed

• Cut sparse state vector by @WrathfulSpatula in #1018

Full Changelog: vm6502q.v9.11.8...vm6502q.v9.11.12

sha1sum results:
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