Implement servo angles (#58)

/etc/kvmd/override.yaml
```
kvmd:
    gpio:
        drivers:
            servo1:
                type: servo
                chip: 0                  # PWM Chip Number
                period: 20000000         # Servo Motor SG90 Period in nano-seconds
                duty_cycle_min: 350000   # Servo Motor SG90 duty_cycle for -90 degrees
                duty_cycle_max: 2350000  # Servo Motor SG90 duty_cycle for +90 degrees
                angle_max: 90            # Servo Motor SG90 angle at duty_cycle_max
                angle_min: -90           # Servo Motor SG90 angle at duty_cycle_min
                angle_push: 45           # Servo Motor SG90 angle to push button
                angle_release: 20        # Servo Motor SG90 angle to release button
        scheme:
            short_press:
                driver: servo1
                pin: 0                       # Pin number is the PWM channel number on the PWM Chip
                mode: output
                switch: false
                pulse:
                    delay: 0.5
                    max_delay: 2
            long_press:
                driver: servo1
                pin: 0                       # Pin number is the PWM channel number on the PWM Chip
                mode: output
                switch: false
                pulse:
                    delay: 2
                    max_delay: 2
            extra_long_press:
                driver: servo1
                pin: 0                       # Pin number is the PWM channel number on the PWM Chip
                mode: output
                switch: false
                pulse:
                    delay: 10
                    max_delay: 20
        view:
            header:
                title: Controls
            table:
                - ["#Servo - Short Press", "short_press|Press"]
                - ["#Servo - Long Press", "long_press|Press"]
                - ["#Servo - Extra Long Press", "extra_long_press|Press"]
```

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