ECM example with VIBE thermal
The previous "ec-model" was renamed to "ecm-hppc-discharge".
Added "ecm-thermal" which is an example of using the equivalent circuit model with VIBE. It is similar to the "ntg-thermal" example but uses the equivalent circuit model. Thermal parameters for VIBE such as heat capacity, convective heat transfer coefficient, and ambient temperature from the ECM are written to the "input_keyvalue" for VIBE. The heat capacity and heat transfer coefficient terms are determined by applying the ECM to the battery discharge data.
Updated the README based on the above changes.