Count indexing as variable usage

[Denneisk]

Description:
Using array access on a variable does not mark the variable as used, therefore making it warn as unused.

To Reproduce:

1. Create an array or table in E2
2. Set an index to anything
3. Receive warning

let Table = table()
Table[1] = "test"

Expected behavior:
The variable should be marked as used.

[Vurv78]

It's not using the variable though.

[Denneisk]

It's not using the variable though.

It's may be ambiguous whether array access is being used meaningfully or not, but I think it's worth assuming that it is. I think it should be apparently how this could be used meaningfully.

function setup(Input:table) { // Warning: Unused variable: Input
    Input[1] = 123
}

Table = table()

setup(Table)

print(Table[1, number])

Also, with wirelinks:

let WL = Lamp:wirelink() // Labeled unused 
WL["On", number] = 1

[Vurv78]

In those cases where the table is provided by something out of scope, could allow this behavior

[Vurv78]

Then again this is kind of just complicating things since we'll have to make another exception for wirelinks I guess..

I'd be fine with reverting the behavior for now. I mean that's how it initially was til it was suggested to be changed to the opposite. Maybe in the future I'd bring it back fully featured as I planned here but in the analyzer where the complexity would be isolated.

[Vurv78]

Not a bug though so converting to discussion.