Add H61C5 and adjust H61C3

The led count 70 on H61C5 was calculated empirically. The strip can be cut, but mine is full-size. supportRazer had no impact and allowed controlling only one LED, but supportFeast enabled the separate LED control. Interestingly enough, if you choose less than 70 you still can manage the whole strip, just the segments you control will be bigger (see below example with 4 leds). Lastly, the H61C3 is the same as H61C5, but 3m instead of 5m, so I've enabled supportFeast there too.

Edit For the record, I've tried setting the led count to 4, and then the strip works very funky. See the image. The zone with red stripes is where you can cut off a part of the strip. And the big red stripe is the last place where you can cut it off. The last led controls all the rest of the strip. And if you have 2 adjacent leds on, then the whole strip in between is on. What is interesting is that when you have 70 leds you can control that part that can be cut off properly.