Update fuels.csv

Author: phumthep

database/fuels.csv

@@ -6,7 +6,10 @@ solar,#fdbb84,
 wind,#deebf7,
 oil,#252525,
 biomass,#33a02c,
-waste_heat,#d95f0e,
+solid_waste,#d95f0e,
 import,#54278f,
 shortfall,#fa9fb5,
 curtailment,#f768a1,
+charging,#238443,
+discharging,#f16913,
+undefined,#000000,