Thermal model updates: feasibility & unit tests#374

Draft

werdnum wants to merge 3 commits intodavidusb-geek:masterfrom werdnum:thermal-updates-nov24

+288-36

Commits on Nov 13, 2024

Updates for thermal management to address feasibility issues:
werdnum
committed
Fixes for cases where the def_start_timestep, def_end_timestep and similar are not specified for all deferred loads (treat them as the default)
werdnum
committed
Unit tests for thermal management
werdnum
committed