HumpFlicker<A, B, HUMP_WIDTH> HumpFlickerL<B, HUMP_WIDTH>
Makes a random "hump" which is about 2xHUMP_WIDTH leds wide.
https://github.com/profezzorn/ProffieOS/blob/6f8add544c627172ad2dd698c90e5e55078a420a/styles/hump_flicker.h#L4