Multibrot from power from 2 to 8 at size 1E-2 - 2E-6 with distance estimation

Multibrot from power from 2 to 8 at size 1E-2 - 2E-6 with distance estimation. (Also to power -3 at bigger size). Points outside the set are coloured by usual escape time algorithm. Colour of points inside the set is determined by period detection, their brightness by distance estimation. The most interesting feature - the program automatically keeps mini-set (small cardioid at power 2) in the field of view while it moves in the complex plane.