Everywhere/IPC: IPC::Message arguments are often needlessly copied
Currently we pass IPC messages and their internal (complex) arguments around by cons-reference, although we do not use them after invoking the handler.
A lot of users that take a Vector as an argument, want to keep that Vector, and move it around, which is currently not possible without the use of const_casts.
To solve this issue with out any const_casts we would need to change the IPC handler signatures¹ and the invocation logic² ³ of the IPC system, step 1 would involve a bigger refactor.
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