Clean up the names of the configuration settings

[sstone1]

The extension currently has quite a few configuration settings:

    "fabric.runtime": {
        "ports": {
            "orderer": 17050,
            "peerRequest": 17051,
            "peerChaincode": 17052,
            "peerEventHub": 17053,
            "certificateAuthority": 17054,
            "couchDB": 17055,
            "logs": 17056
        },
        "developmentMode": false
    },
    "fabric.gateways": [],
    "fabric.wallets": [],
    "blockchain.ext.directory": "~/.fabric-vscode",
    "extension.home.showOnStartup": true,
    "blockchain.repositories": []

These names are mixed in with all other configuration settings from all other extensions. They're not in a namespace for our extension. It would be better if these names were consistent - for example, a single ibm-blockchain-platform prefix?

The worst offender is "extension.home.showOnStartup" which doesn't mention blockchain, fabric, or IBM. It could be from any extension!

v1.0.0 is our chance to get this right, so we should change it before GA.

[heatherlp]

I still hate the idea of all our old contributions hanging around user settings though :(

[heatherlp]

I am pro them being consistent :)

[Jakeeyturner]

"ibm-blockchain-platform.fabric.runtime": {},
"ibm-blockchain-platform.fabric.gateways": [],
"ibm-blockchain-platform.fabric.wallets": [],
"ibm-blockchain-platform.ext.directory": "~/.fabric-vscode",
"ibm-blockchain-platform.ext.repositories": [],
"ibm-blockchain-platform.home.showOnStartup": true

How about this?