GetResourceName default parameter and Global variable

[Nico8340]

Additions

• Adds a default parameter to the getResourceName function, which is based on the current resource
• Adds a global variable named resourceName, which is based on the current resource

Antecedent

This is a continuation of the previous pull request (#3363) which fixed the previously mentioned map editor issues.
Thus this pull request closes #3527

Example

addEventHandler("onResourceStart", resourceRoot,
    function()
        local myResourceName = resourceName or getResourceName()
        local myResourceMessage = string.format("Resource successfully started: %s", myResourceName)

        outputServerLog(myResourceMessage)
    end
)

[Dutchman101]

Both you and Tracer submitted a fixed PR at the exact same time (lol)

Code reviews and (self-)feedback should determine which of the 2 PR's is ideal, and to save us time, also please add details on what the problem was and how you fixed it; there's no specific "fix" commit.

Tracer's PR: #3530
Nico's PR: #3531

[Nico8340]

This pull request contains the option to omit the parameter of the getResourceName function, which was the intended functionality of the reverted pull request, so this pull request restores it with the correction.
The problem was with the !resource->IsActive() check, after removing this the mentioned issue no longer occurs.

cc @Dutchman101

[Nico8340]

The other pull request was closed by Tracer's own decision, so this is the only one left.

[TracerDS]

👍

[TracerDS]

LGTM