Change proto arms to rely on interfaces

[jChicote]

Description

The proto arm blueprints are relying on the implementation of both the player and weapons.

• Its good to know that the implementation of the character arms is not reliant on the player character blueprint. The player character blueprint is functionality pertaining to the "PLAYER" while the character arms blueprint is coupled with the skeleton and the mesh of the character.

Acceptance Criteria

• [x] Character arms relies on blueprints
• [x] The player gives the blueprint the reference it needs
• [x] The ABP should not know to much of the weapon BP

Implementation

• [x] Create interface for initialisation and invocation of functions
• [x] Weapon references to its state are removed

[jChicote]

Extra Scope

• [x] ApplyWeaponOffset needs to rely on interface
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