Add Aliceserver as a debugger target. #440
                
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This PR implements Aliceserver as a usable debugger target.
Aliceserver, being a work in progress, is a new debugger that implements both the DAP and MI protocols using Alicedbg at its core.
It currently only supports the single-session mode, and only supports attach and launch requests.
Requests to implement:
By knowing what requests an established client make, I am able to extend Alicedbg, giving me a better direction for future features.
Feel free to perform a rebase.