Remove trivial snippets

[oriongonza]

There are many snippets that don't do much, such as

    "mod": {
        "prefix": "mod",
        "body": ["mod ${1:name};"],
        "description": "mod …;"

Having the snippet is not very useful in this case. Snippets should be reserved for common idioms that are somewhat annoying/long to type.

These should be removed to reduce noise and to allow more snippets in the future.

There are also some extremely niche macros that here such as include!(), column!() and line()! which I'm not sure why they are even snippets

[OkelleyDevelopment]

Hi @dev-ardi, I started a PR here, to address this issue. When you get a moment, I'd appreciate your thoughts on the snippets removed.