Feature: Initial multiple cameras support

[bacinsky]

Hi, everyone.

I took some time to patch the code to support the multiple cameras timelapse recording.

It is a quick fix an it needs some proper support to configure it via GUI, but I don't know how, because it is somehow a part of Mainsail and my time is limited.

So this implementation doesn't support image rotations and if you want to use it, you have to enable it in your configuration like following:

# moonraker.conf

[timelapse]
multi_cam_enabled: True

It will record all of your cameras and if you want to ignore some add following setting and replace camera names by yours:

# moonraker.conf

[timelapse]
multi_cam_ignore: MyCam01,MyCam02

Recorded timelapses will appear in your Timelapse Files.

Enjoy.