Internals, $$ Ed.

@adambeynon @meh I normalized all internal properties to use $$ instead of the underscore jungle you can see below. 

@adambeynon I know you didn't agree on using that prefix, but I had to take action and I think it will be rather easy to switch from it to whatever we'll agree on.

💢 _Of course, it's possible that I missed something_

ℹ️ _This could also be a good time to document some of these internals_

```
__meta__     > $$meta
__inc__      > $$inc
__dep__      > $$dep
__mod__      > $$mod

__autoload   > $$autoload
__parent     > $$parent

_isClass     > $$is_class
_isSingleton > $$is_singleton
_isArray     > $$is_array
_isRange     > $$is_range
_isRegexp    > $$is_regexp
_isBoolean   > $$is_boolean
_isString    > $$is_string
_isProc      > $$is_proc

is_lambda    > $$is_lambda

_base_module > $$base_module
_orig_scope  > $$orig_scope
_full_name   > $$full_name
_donated     > $$donated
_methods     > $$methods
_proto       > $$proto
_scope       > $$scope
_klass       > $$class
_super       > $$super
_name        > $$name
_jsid        > $$jsid
_def         > $$def
_id          > $$id
_p           > $$p
_s           > $$s
```