Added condition to check for number of inputs (analog). Should again be compatible with both Mega and normal
Added "ChipScanning" test

This test scans the I2C bus for MCP23017 and PCA9685 chips, if the
latter type is found it will blink LEDs in a certain pattern. The
sketch also looks out for deviations from the start up state and
flashes the LEDs fast if any - this is great for burn-in tests which
can alert if there are any problems to take a closer look at.
Small updates.