[WIP] Capability List

[JakeOShannessy]

This PR is to address #47, #51, and #52. Because these three will require changing how capabilities are assigned they will affect a lot of tests, and will need to be dependent on each other. I will follow this plan:

• [ ] Add an ability to the kernel to append a capability to the capability list of procedure.
• [ ] Replace all of the tests to use this feature.
• [ ] Change the tests to register each procedure initially with no capabilities.
• [ ] Remove the parameter from the register syscall which allows initially registering capabilities (addressing #47).
• [ ] Add a syscall (with corresponding capability) to give access to the ability to append capabilities (addressing #51).
• [ ] Add an ability to the kernel to delete a capability from a capability list.
• [ ] Add a syscall to access deletion of capabilities.

[Latrasis]

Not sure what happened here. Seems like both PR's got merged... whoops!

[JakeOShannessy]

Yeah, I reckon it just got auto-merged because it was empty, I'll make a small commit and create a new one.

[JakeOShannessy]

Reinstated as #102.