[FEATURE] Utility Delegates

[nbness2]

What has been done?

• Mutliple delegate features have been added to reduce the tediousness and bugs caused by rewriting code many times, and as a by-product make the code look a lot more tidy while keeping readability (depending of course on how you name stuff)
• Added the functionality to use an AttributeKey<T> as a delegate for a Pawn extension property returning T. Example: var Player.protectItem by PROTECT_ITEM_ATTR -- You can operator invoke the AttributeKey<T> with a T value to return an AttributeDelegate<T> with a default value that you passed. Example: var Player.protectItem by PROTECT_ITEM_ATTR(false)
• Added the functionality to set a Varp as a T delegate for a Player extension property returning T. -- IntVarp is included as a sample implementation of VarpDelegate. Example: var Player.questPoints by IntVarp(101)
• Added the functionality to set a Varbit as a T delegate for a Player extension property returning T. -- IntVarbit is included as a sample implementation of VarbitDelegate. Example: var Player.slayerPoints by IntVarbit(4068) -- BoolVarbit is included as a sample implementation of VarbitDelegate. Example: var Player.gargoyleSlayer by BoolVarbit(4027)

[nbness2]

[576657d] Fixed VarbitDelegate.getVarbit using varbitId rather than varbitDef.varp resulting in either the wrong value being gotten or an exception being thrown.