Add energy balance KPI block for TEASER building

[FWuellhorst]

@TobiasSpratte : This branch adds a better way to balance a thermal zone. I did not add the block for HOM AixLib, as it would further increase computation time. But this could be done in the future, same in SPAWN.
Can you review this PR? :)

Closes #92

[ebc-aixlib-bot]

Errors in regression test. Compare the results on the following page\n https://rwth-ebc.github.io/BESMod/92-add-kpi-block-for-thermal-zone-kpis/charts

[ebc-aixlib-bot]

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[TobiasSpratte]

Looks fine to me!