log: move miscellaneous filter/matcher options to walkopts
Maybe this is the most uninteresting patch. I want to remove the dependency
on untyped/unlabeled opts dict at all.
I thought --no-merges and --only-merges could be merged into a single enum
value, but actually they both can be set to filter out everything.
{
// Enforcing
"eqeqeq" : true, // true: Require triple equals (===) for comparison
"forin" : true, // true: Require filtering for..in loops with obj.hasOwnProperty()
"freeze" : true, // true: prohibits overwriting prototypes of native objects such as Array, Date etc.
"nonbsp" : true, // true: Prohibit "non-breaking whitespace" characters.
"undef" : true, // true: Require all non-global variables to be declared (prevents global leaks)
// Environments
"browser" : true // Web Browser (window, document, etc)
}