Move serialize utils to dedicated folder
Serialize key utility

It will help replace all ident/sKey handling with single sKey
switch -> if
Unserialize key utility
Unify sKey and ident concept of object properties
Fix meta properties fix
Unify sKey and ident concept on multiple items
-- lint
Fix id values in observables
Seclude injectPrimitiveNested to outer module
getDescriptorPropertyObservable -> getDpObservable
-- whitespace
Rename `$get` to `$getOwn`
Rename `getDescriptor` to `getOwnDescriptor`
`_getDescriptor_` and `$get`
_getMultipleItem_ -> _getOwnMultipleItem_
`_getMultipleItem_`
`$get` for multiples
`_getDescriptor_` and `$get` for sub descriptors
Use `_getDescriptor_`