Fine tune for intercom XL camera

[350d]

• max fps
• image snapshot link

[rudyberends]

i will adjust the max fps to match your setting.

I cannot merge this as the image snapshot link will break V2 compatibility. The intercomv2 does not have this image url.
Does it really make a difference using this image url vs the video url? If it really is, then we can implement a check where V1 intercoms will default to this image url.

[350d]

Ok, keep the original url. I've tested it against static jpg and there is no big difference:
jpg:

0.02s user 0.01s system 12% cpu 0.241 total
bench: utime=0.004s stime=0.002s rtime=0.013s
bench: maxrss=10776576kB

mjpeg:

0.02s user 0.02s system 11% cpu 0.369 total
bench: utime=0.004s stime=0.002s rtime=0.011s
bench: maxrss=10797056kB

[rudyberends]

I kept the original url. The other changes are in the latest beta. I will close this request without merging.