Add Aliceserver as a debugger target.

[dd86k]

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:

• [ ] Thread info

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.