New options proposal: spaces around arguments

[FarSeeing]

I'd like to propose a new option: adding space between opening bracket and the first argument (in function call, array, property access), also between the last one and the closing bracket.

This is it:

[], {}                  // empty arrays and objects stay the same
[1, 2, 3]               // [ 1, 2, 3 ]
arr[0]                  // arr[ 0 ]
obj[prop]               // obj[ prop ]
function func(a, b) {}  // function func( a, b ) {}
func(arg1, arg2)        // func( arg1, arg2 )

[bitwiseman]

Partially addressed by #235.

Still need to provide setting for spaces inside square brackets.