fix: use starknet::ContractAddress in #[system]

[notV4l]

• fixes [BUG] system contracts can't be compiled #995
• use starknet::ContractAddress instead of ContractAddress
• use world_address instead of world_dispatcher

[credence0x]

Is it possible to just use IWorldDispatcher instead of ContractAddress? if we can't use the dispatcher we should probably change the variable name to world_address instead of world_dispatcher

[wraitii]

Is it possible to just use IWorldDispatcher instead of ContractAddress? if we can't use the dispatcher we should probably change the variable name to world_address instead of world_dispatcher

Hm as a matter of fact it's the IWorldDispatcher which is stored, it just happens that the serialised data is identical. Probably better to change it.

[notV4l]

updated to world_address

[notV4l]

back to world_dispatcher: IWorldDispatcher