[PERFORMANCE] Optimise Relay switching

[AlexanderTonn]

 :rocket: Please describe your performance changes

• the following functions are delaying the code execution
• the "time delay" should be done by using function triggers
• probably you also can reduce the two functions to a single function

Affected Functions

void relayOnMppt() {
  auto ms = secondToMs(uiSett_PVswitchingDelay);
  digitalWrite(K2_INVERTER_AC, LOW);
  delay(ms);
  digitalWrite(K1_INVERTER_DC, LOW);
  delay(ms);
  digitalWrite(K3_MPPT_CHARGER, HIGH);
  byModeActual = BATTERY_MODE;
}
void relayOnInverter() {
  auto ms = secondToMs(uiSett_PVswitchingDelay);
  digitalWrite(K3_MPPT_CHARGER, LOW);
  delay(ms);
  digitalWrite(K1_INVERTER_DC, HIGH);
  delay(ms);
  digitalWrite(K2_INVERTER_AC, HIGH);
  byModeActual = INVERTER_MODE;
}

 :pencil2: Describe the solution you'd like

• A clear and concise description of what you want to happen.