Implement HTTP requests for Squirrel scripts

[Erlite]

Requires R2Northstar/NorthstarMods#531.

This PR aims to allow Squirrel scripts to make HTTP requests. This would allow them to do things like query APIs, send data to a server to save and more.

All HTTP request methods are supported. However, the following limitations apply:

• You cannot make a request to a private network address.
• You may only make a request to a hostname that resolves to an IPv4 address.

The above limitations are for security reasons. If for some reason, you need access to private network addresses or IPv6 hosts, you may start the game with -allowlocalhttp to bypass those checks.

You can also opt-out of letting mods use HTTP requests by starting your game with -disablehttprequests.

Checklist

• Native HttpRequestHandler
• Squirrel functions to make an HTTP request.
• Prevent localhost HTTP requests unless explicitly enabled using -allowlocalhttp.
  • This is to prevent any potential exploit. This can be disabled for certain... usecases.
• Add support for "arrays" in query parameters.

Example

I will be simplifying the functions a little bit, but for now, this is how it looks:

void function OnSuccess(int code, string body, string headers)
{
    printt(code, body, headers)
}

void function OnFailure(int error, string message)
{
    printt(error, message)
}

void function NSTestRequest()
{
    HttpRequest request = { ... }
    request.method = HttpRequestMethod.GET
    request.baseUrl = "https://northstar.tf/accounts/get_username"
    request.headers["hello"] <- "world"
    request.queryParameters["uid"] <- GetPlayerArray()[0].GetUID()
    request.contentType = "application/json"

    NSMakeHTTPRequest(request, OnSuccess, OnFailure)
}

Screenshots.

[Erlite]

Rebasing murdered the history a little, oh well.

[Erlite]

Feature complete, fixing format errors, and I'll also write the Squirrel side before we can consider reviewing and merging.

[Erlite]

Requires the Squirrel side first, making a PR later, don't merge this yet!

[GeckoEidechse]

Set to draft to prevent accidental merge

[Erlite]

Ready for review.

[Erlite]

Add -disablehttpssl to ignore SSL verifications

This is especially useful when the host's ssl cert is invalid, or when testing in development for things like APIs running on localhost and the API refuses non-HTTPs requests.

[emma-miler]

Code review looks good, just a few small things. Will test and re-review once these issues are resolved