Customizable Temperature Tower with wait

Exactly the same thing as [what this is remixed from](https://www.thingiverse.com/thing:2615842), but using the G-code [M109 (set hotend temperature and wait until it hits it)](http://marlinfw.org/docs/gcode/M109.html) instead of [M104 (set hotend temperature and carry on)](http://marlinfw.org/docs/gcode/M104.html).

This difference matters because the print is relatively quick, so the first few layers may not actually be representative of the temperature they were targeting. This is particularly the case if you print a regular temperature base (e.g. 215°C for PLA), then jack up the temperature for the first tower segment (e.g. 240°C) - with the original `M104` it will barely reach the right temperature before the segment is done.