Implement Magtheridon strategy (#1721)

I'm marking this as a draft for now because I haven't done a detailed
review of the code, but I'm posting it now in case anybody wants to give
it a try.

Here's what the strategy (should) do.

### **Channeler Phase**

While you can probably AoE down all five Hellfire Channelers, that's
more dicey with IP nerfs and it's no fun, so the strategy takes what
would have still been considered an aggressive approach back in the day
by (1) assigning the Main Tank to the first Channeler, (2) having
Hunters misdirect two more Channelers to the MT, and (3) one Off Tank
picking up each of the fourth and fifth Channelers and dragging them out
of Shadow Volley Range from the main group. Sometimes the pull gets a
little wonky and one of the OTs might end up with one of the Channelers
that was intended for the MT, but it should work out in the end.

DPS will move through Channelers from Square -> Star -> Circle ->
Diamond -> Triangle. Once Square, Star, and Circle are down, the MT will
go sit by Magtheridon and wait for him to become active instead of
helping with the last two Channelers. I could have made the MT help with
the fourth Channeler too, but it's not needed, and positioning to pick
up Magtheridon after the third Channeler is a failsafe for low DPS
groups that aren't able to get four down before Magtheridon breaks free.

The top priority for Warlocks is to banish/fear the Burning Abyssals,
and they will continue to do so even after Magtheridon becomes active
(you are not supposed to kill the Abyssals; they have a gazillion HP and
automatically despawn after a minute). Their next priority is to put
Curse of Tongues on the Channelers.

### **Magtheridon Positioning**

The MT will pick up Magtheridon and pull him (moving backwards because
Magtheridon kind of hits like a bus) to a position up against the far
wall. Ranged DPS will spread out from a point roughly in the center of
the room, and Healers will spread out from a point that is a little
closer to Magtheridon. I have not built in aoe avoidance (except for
cube clickers, see below) because the general avoid aoe strategy seems
to work fine for this fight.

### **Clicking Manticron Cubes**

Now, the fun part. Bots will be assigned to clicking cubes by standard
group selection order (reverse join order), but assignment is done via
two passes. The first pass will look to select five ranged DPS bots that
are _not_ Warlocks. This is because Warlocks may still be needed to keep
Abyssals banished/feared and because Warlocks of all three specs put out
by far the most damage of all ranged DPS at level 70 in pre-raid/T4
gear. If there are not five non-Warlock ranged DPS bots available, then
the logic goes to the second pass, which can pick any bot that is not a
Tank.

Cube clicking works on a timer:

1. 48 seconds after Magtheridon breaks free, assigned cube clickers move
near their cubes (but a few yards outside of interact distance). During
this time, they should move around still to avoid Debris (by maintaining
distance from the triggering NPC) and Conflagration (by maintaining
distance from the triggering gameobject). Blast Nova is on a 54.35s to
55.4s timer, and I found 48s to always be ample time to get to the
cubes, but YMMV so this is a good thing to test. Going to a cube too
early not only takes away DPS but also risks more hazards appearing
on/around the cube that will then cause problems when the cube needs to
be clicked.
2. Blast Nova is a 2s cast, followed by a 10s channel (if not
interrupted by the cubes). As soon as the cast begins, bots will move
into interaction range and click the cube. Well, there is a randomized
delay between 200ms (about the fastest possible human reaction time to
visual stimuli) and 1500ms. It didn’t happen to me in a few runs, but it
may be possible that the delay causes the raid to eat one tick of Blast
Nova (I’m not sure if the first blast comes as soon as the channel
starts). Again, another good thing to test, but also one tick is not
going to kill anybody, and it’s arguably good to introduce some degree
of imperfection.
3. Once Blast Nova stops channeling (i.e., all five cubes have been
clicked and channeled simultaneously), bots will interrupt their cube
clicking and go back to regularly scheduled activities. Again, I’ve
introduced a randomized delay, this time between 200ms and 3000ms. Note
that bots can easily be perfect at this—if I don’t do the randomized
delay, they click and let go so fast that you can barely even see the
beams appear. It’s so atrocious for immersion that I consider the lack
of any randomization to be totally unacceptable for this strategy.
4. 48s after Blast Nova, bots will go back to their near-cube positions,
rinse and repeat.

If an assigned cube clicker dies, another bot should be immediately
assigned. All bots in the raid track the same timer so the new bot
should step into the prior bot’s shoes. Of course, if Blast Nova is
about to go off and a clicker dies next to a cube, you’re probably
wiping because I didn’t assign backups to stand in place. That’s too
much of a dad guild-level strategy even for me.

And that’s about it. Figuring out the cubes was a tremendous pain in the
ass, but I’ve really enjoyed the learning process.

---------

Co-authored-by: bash <31279994+hermensbas@users.noreply.github.com>

src/PlayerbotAI.cpp

@@ -1534,6 +1534,8 @@ void PlayerbotAI::ApplyInstanceStrategies(uint32 mapId, bool tellMaster)
         case 533:
 			strategyName = "naxx";  // Naxxramas
             break;
+        case 544:
+            strategyName = "magtheridon";  // Magtheridon's Lair
         case 565:
             strategyName = "gruulslair";  // Gruul's Lair
             break;