Remove build manifest, replace with other files (see details)

[hansl]

Because of 2 competing requirements;

• local canister IDs should be tied to the replica state
• tungsten canister IDs should be version controlled and cloned

We need to have two ways of containing canister IDs; one that is persisted in version control and one that isn't.

Because of this, we allow people to specify an type in their dfx.json networks keys, which is one of two values:

• ephemeral, which is the default for local. The canister_ids.json files will be created inside .dfx.
• persistent, which is the default for non-local networks. The canister_ids.json file in the root will be updated when creating canister IDs.

The format for the canister_ids.json file is the same regardless of where it is created;

{
  "CANISTER_NAME": {
    "NETWORK_NAME": "ic:123456"
  }
}

where NETWORK_NAME can be local, or tungsten or else.

[ericswanson-dfinity]

This is complete.