Tariff support

• New tariff topic
• Fix decimals

consuption/production fix

Fix error that post consuption_high wrong

First release with the basic info

This release contains only the bare minimum info:

• power_consuption 1.7.0 (kW)
• power_production 2.7.0 (kW)
• total_production_low 2.8.1 (kWh, tariff 1)
• total_production_high 2.8.2 (kWh, tariff 2)
• total_consuption_low 1.8.1 (kWh, tariff 1)
• total_consuption_high 1.8.2 (kWh, tariff 2)
• total_gas 24.2.1 (m3)