[ENGINE/CONTENT] Actor buffs & de-buffs + Prayer

[SchauweM]

Game Engine Feature Description

The purpose of this feature is to allow for buffs & de-buffs on the actor. This plugin will allow the Prayer skill to be implemented

Acceptance Criteria

Engine implementation specific

TBD

Prayer specific

• [ ] Activating a prayer buff applies to the effective level of a combat stats. E.G: +10% strength boost at level 90 strength will result in an effective level of 99 strength.
• [ ] You can have an offensive and defensive prayer stack, like (Eagle eye || Mystic might || Incredible strength) && steel skin.
• [ ] You can't have two different attack styles work simultaneously, like the combination: Incredible strength & mystic might, since they are two different attack types (Magic and Melee)
• [ ] You can only have one overhead prayer active at a time

Additional Information

Other additional details relevant to the new feature that were not described above. https://oldschool.runescape.wiki/w/Prayer#Prayers

[Twistt]

with the PR https://github.com/runejs/server/pull/327 - support for prayers (effects) was added to the attack and defense calculations - including base objects to support the effects. Next update will be to apply them as the are cast from the ui.