Only the keyword 'var' should be analyzed

[sharwell]

Currently SA1000 is getting reported in code like the following:

int[] array = new int[0];
array.Select(var => var.Equals(1)); // SA1000

SA1000 should only be reported for cases where var is a keyword, though this could be optimized to simply look at cases where var is the name of a type where a variable is being defined, or possibly just to cases where var is followed by an identifier or the opening parenthesis of a parenthesized variable designator.