Add rotation indicator to Zulrah helper

[kyn3tik]

While learning Zulrah I used the helper but it seemed that when ever I was on the TANZ #7 phase I always got hit from the poison clouds, I stood where it said but after I had got zulrah down I found that the x mark (stand spot) is actually wrong, it needs to be placed the other side of the Zulrah island in the same place as TANZ #8

[badookey]

I had a quick go at this as i've been changing some of the images for issue #13. The issue I see is that zulrah spits clouds before and after TANZ_7. If we moved the spot to the same position as TANZ_8 then players would most likely run through clouds to get there. The way to avoid any clouds is to stand at the current TANZ_7 picture and move to the TANZ_8 position as soon as the clouds dissipate (which is before the end of the TANZ_7 phase).

I see a few other guides use an arrow to signify to move during this phase, as that's the only way to avoid the clouds before & after. I think you may also be standing too close to zulrah if you're taking damage from the clouds, note that there are some variations in the pictures, some are directly next to the pillar and others are 1 tile back.

I also notice this on NORMAL_4 which has a cloud leftover from the previous phase where the image suggest the user stand.

There has been some discussion on this previously on issue #19, with @while-loop suggesting a "Show expected movement" toggle

[while-loop]

I'm all for an additional toggle. I'm glad you're giving the plugin some more TLC <3