Add secluso-toggle and secluso-reset services/recipes

[jkaczman]

Fixes #20

[jkaczman]

@arrdalan - In what order should the toggle/reset services be put online? Do any of them need to be before/after the camera hub? What about for networking; do any of them need the network to be online first? Are there any runtime dependencies for either?

[arrdalan]

• There's no required ordering between reset/toggle and camera hub.
• The reset service needs network to be online (for the upload_log function, which is triggered when the user deliberately presses the button repeatedly several times in a row).
• The toggle service needs the i2c-dev kernel module (which is not loaded by default in our kernel). We can have the OS load it at boot time via:

echo i2c-dev > /etc/modules-load.d/i2c-dev.conf

• For the toggle service, we need to add the following line to /boot/config.txt:

dtoverlay=pwm,pin=13,func=4

And we need to add the required pwm overlay file to /boot/overlays/. I got it from the Raspberry Pi official OS and tested it successfully. I can push the file to this PR if/when needed.