[Feature] Implemented /shield ability and related affects

[KayenEQ]

8/10/21
Better late than never!

Implemented the /shield ability.

/shield command mechanics
Warriors get this skill at level 30
Used by typing /shield while targeting a player
While active for the duration of 12 seconds baseline. The 'shield target' will take 50 pct less damage and the 'shielder' will be hit with the damage taken by the 'shield target' after all applicable mitigation is calculated. The damage on the 'shielder' will be reduced by 25 percent, this reduction can be increased to 50 pct if equipping a shield. You receive a 1% increase in mitigation for every 2 AC on the shield. Shielder must stay with in a close distance (15 units) to your 'shield target'. If either move out of range, shield ends, no message given (how live does it). Both duration and shield range can be modified by AA. Recast is 3 minutes.

Example: Wizard is being hit by npc who normally is hitting for 100 max hit. Warrior shields Wizard. NPC now hits Wizard for 100 damage, since shielded, the Wizard takes 50 damage and the Warrior takes 75 damage (without a shield equipped)

Perl quest function added that can be used to allow this ability to be used on any player/npc with maximum flexibility.

Perl_croak(aTHX_ "Usage: Mob::ShieldAbility(THIS, uint32 target_id, [int32 max_shielder_distance = 15], [int32 shield_duration = 12000], [int32 shield_target_mitigation= 50], [int32 shielder_mitigation = 50], [bool use_aa = false], bool [can_shield_npc = true]");

Implemented SE_ExtendedShielding 230
extends the range of your /shield ability by an amount of distance, base: distance units, limit: none, max: none

Implemented SE_ShieldDuration 255
extends the duration of your /shield ability, base: seconds, limit: none, max: none

Implemented SE_PetShield 210
allows pet to 'shield' owner for 50 pct of damage taken for a duration
base: Time multiplier 1=12 seconds, 2=24 ect),
limit: mitigation on pet owner override (not on live) - Added to allow for more flexibility, if set to zero will get default behavior
max: mitigation on pet override (not on live) - Added to allow for more flexibility, if set to zero will get default behavior

Mages have this his AA in our database named 'Shared Health'. It will now be functional.

[Akkadius]

Left a few comments; there's merge conflicts as well.

You're just pumping these out like the good ol days! <3

[Akkadius]

We chatted async in DM's on some pointer feedback; will loop back after iteration

[Akkadius]

Took care of a bunch of syntax and typo things