[12731] Implement spell effect 46292

Signed-off-by: Xfurry <xfurry@scriptdev2.com>
[12732] Implement TARGET_RANDOM_UNIT_CHAIN_IN_AREA

Also unify the TARGET_RANDOM_CHAIN_IN_AREA code

Signed-off-by: Xfurry <xfurry@scriptdev2.com>
[12733] Implement TARGET_FRIENDLY_FRONTAL_CONE

Signed-off-by: Xfurry <xfurry@scriptdev2.com>
[12734] Implement basic support for area 284 - Trigger Linked Aura

Notes: there are various cases that are not yet implemented, such as Gear Scaling or Death Knight spells