Should recognize variables used with differing case

[mpaluchowski]

The following code:

function foo() {
  var bar = 1;
  return Bar;
}

will produce 2 issues:

1. Local variable bar is not used in function foo, consider removing it, on line var bar = 1;
2. Variable Bar is not a valid name. Please use CamelCase or underscores, on line return Bar;

Issue 1 is a false positive, because the variable is used, albeit with a different case. Issue 2 is valid, but doesn't really point out the real problem, that the same variable is used with inconsistent case.

I suggest CFLint becomes a bit smarter about this and instead of these two issues reports one, something a long the lines of: "Variable Bar is used with inconsistent case. Please use the same case in all references as in the declaration."

[ryaneberly]

@mpaluchowski , UnusedLocalVarChecker is now case insensitive. Thanks!

(The 2nd message about camel case is a valid checker, disable it if you don't want it)