Enable Lizard with the latest Viper IDE / ViperServer

[aterga]

Since Viper IDE started using a new language server implementation, this extension cannot be used anymore.

This ticket would cover re-enabling Lizard with the latest Viper tool releases.

In the meantime, one can still get Lizard to work with Viper IDE v3.0.1 and https://github.com/viperproject/viper-ide/releases/tag/21.07-RC3 and the following verification backend spec in settings.json:

(note the following arguments: --disableCaching, --counterexample native, --enableMoreCompleteExhale)

"viperSettings.verificationBackends": [
        {
            "v": "674a514867b1",
            "name": "silicon-debug",
            "type": "silicon",
            "paths": [],
            "engine": "ViperServer",
            "timeout": 100000,
            "stages": [
                {
                    "name": "verify",
                    "isVerification": true,
                    "mainMethod": "viper.silicon.SiliconRunner",
                    "customArguments": "--z3Exe /usr/local/bin/z3 --disableCaching --counterexample native --enableMoreCompleteExhale $fileToVerify$"
                }
            ],
            "stoppingTimeout": 5000
        },
]