Datarefs that are part of an array don't automatically have numbers in [n]

[danklaue]

It'd be nice to have a sensor that automatically determines whether the dataref to be used is part of an array. If it IS part of an array, it would be good to have some form of reminder for the end-user to fill out the square brackets with the array index number.

[der-On]

A small warning icon could also indicate if the dataref was found in Datarefs.txt. This can prevent spelling mistakes.

[tngreene]

See also #345