[yaml] [sql] [lua] Implement Hydra Mechanics

[ThrisStraizo]

I affirm:

• I understand that if I do not agree to the following points by completing the checkboxes my PR will be ignored.
• I understand I should leave resolving conversations to the LandSandBoat team so that reviewers won't miss what was said.
• I have read and understood the Contributing Guide and the Code of Conduct.
• I have tested my code and the things my code has changed since the last commit in the PR and will test after any later commits.

What does this pull request do?

This PR implements all the mechanics for Hydra, including the the Hydra mixin, which governs how heads are broken and regenerate. From my limited time interacting with Hydra in Nyzul, its very likely they all work the same, using decreased head respawn rates that actively reduce the timer as the Hydra loses HP.

TY @siknoz for these extensive tests.

Using a modified version of the break mixin by @Nobutadas, I was able to get a very accurate looking version of head break and regenerate behavior.

The mixin also provides a 3k tp injection on head regeneration, which I've confirmed is used by other hydras.
Hydra in Wajoam also uses a tp ability every time he draws in.

All resistances and immunities double checked in my own caps.

https://youtu.be/6sxZ64itp7I
https://youtu.be/lHxfvDWQJa0

Steps to test these changes

Fight the 3 headed horror.

[Xaver-DaRed]

proposal

entity.onMobMobskillChoose = function(mob, target, skillId)
    local skillList = {}
    local skillInfo =
    {
        [1] = { xi.mobSkill.TREMBLING,       100, -1, true,  true  },
        [2] = { xi.mobSkill.SERPENTINE_TAIL, 100, -1, true,  false },
        [3] = { xi.mobSkill.BAROFIELD,       100, -1, false, true  },
        [4] = { xi.mobSkill.NERVE_GAS,        30,  0, true,  true  },
        [5] = { xi.mobSkill.PYRIC_BULWARK,   100,  0, true,  true  },
        [6] = { xi.mobSkill.PYRIC_BLAST,     100,  0, false, true  },
        [7] = { xi.mobSkill.POLAR_BULWARK,   100,  1, true,  true  },
        [8] = { xi.mobSkill.POLAR_BLAST,     100,  1, false, true  },
    }

    local hpp         = mob:getHPP()
    local brokenHeads = mob:getAnimationSub()
    local isInFront   = target:isInfront(mob, 128)
    local isBehind    = target:isBehind(mob, 128)

    for i = 1, #skillInfo do
        if
            hpp <= skillInfo[i][2] and
            brokenHeads <= skillInfo[i][3] and
            (skillInfo[i][4] or isInFront) and
            (skillInfo[i][5] or isBehind)
        then
            table.insert(skillList, skillInfo[i][1])
        end
    end

    return skillList[math.randomInt(1, #skillList)]
end

[Xaver-DaRed]

I would suggest something similar here. This is hard to follow

[Xaver-DaRed]

and here aswell

[Xaver-DaRed]

guess

[Frankie-hz]

Can you move these to onMobInitialize and delete the res ranks from the mobs.yaml

[Frankie-hz]

If these were captured can we remove the TODO

[Frankie-hz]

same, if these were captured can we remove the TODO

[Frankie-hz]

So since you are checking the regen on every tick I would suggest something like this:

This on top (out of mobFight)

local regenPerHead =
{
    [0] = 150,
    [1] = 70,
    [2] = 10,
}

Then you only need a single line:

    mob:setMod(xi.mod.REGEN, regenPerHead[mob:getAnimationSub()])

[Frankie-hz]

To keep it consistent with the rest of the definitions:

local function handleBreak(mob)