v0.921.0

What's Changed

• Repair HPWHsim energy balancing by @spahrenk in #447
• Change HPWH storage tank setpoint; enable HPWH tank-temp initialization by @spahrenk in #450
• Change method for specifying extra heat to HPWHsim by @spahrenk in #451
• Replace #include <math.h> with #include by @chipbarnaby in #454
• Update CSE to use btwxt v1.0.0 by @chipbarnaby in #455
• HPWHsim cross-platform updates by @spahrenk in #457
• Enable HPWHsim heat-exchange models by @spahrenk in #448
• Expression coverage by @chipbarnaby in #446
• Fix external heat energy balance hpwh by @spahrenk in #458

Full Changelog: v0.920.0...v0.921.0