Rudimentary ACL System Procedure

[Latrasis]

We need a rudimentary Access Control List as a System Procedure for establishing simple user groups. The interface must include:

• #getAccountGroup(address _account): Get GroupId from Account Address
• #setAccountGroup(address _account, uint8 _groupId): Set an Account to associate to a group
• #setGroupProcedure(uint8 _groupId, bytes24 _procId, cap[] caplist): Create Group
• #getGroupProcedure(uint8 _groupId): Get Group Procedure Id
• #fallback: Which makes a call to the group procedure based on msg.sender's groupId.

On construction, should be an interface:

• #init(admin_group _groupId, address _account): Set Admin Group Id and Initial Admin

Also to implement:

• Proxy different accounts to their appropriate group procedures.
• Separate the Entry Procedure from the ACL management.

Edit(Jake): Made some updates to the checklist here, rather than throughout the comments.

[JakeOShannessy]

Looks like further modifications will have to be made to pwasm-abi-derive as it does not support fallback functions.

[JakeOShannessy]

I implemented a proxy(payload) function instead. Using fallback is ergonomically nice, but not critical may not even be the system people want to use.

[JakeOShannessy]

Entry is now separated, so only one group has access to the ACL management API.

[JakeOShannessy]

• Remove panics (they are usually opaque anyway).
• Make from functions fallible.

[JakeOShannessy]

The ACL was implemented in #185.