Autopilot: Add the ability to simulate load in automatic mode

[dbazhenov]

The load is currently controlled in manual mode on the control panel.

Add an autopilot function with multiple modes to the connection settings:

1. Quiet waves - Cycle from minimum load to maximum load in 15 minutes
2. Active waves - Cycle from minimum load to maximum load in 5 minutes
3. Sharp peaks - Stable load at 10%, every 3 minutes a sharp increase in load to level high, then back to stable. As a high level take 50%, 75%, 100% intermittently.
4. Random - Choose an random level, hold it for 30-120 seconds, choose a new random level.

When one of the autopilot modes is selected, the number of parallel connections will be adjusted automatically.