make good __repr__, __str__ and tokenize methods to core and protocol

[Zewsic]

let make an example sfs object:

{
"num": Int(12),
"obj": {
  "what": Bool(false)
 }
}

repr

get a object in debug-mode
<SFSObject(2) at 0xXXXXXXX>

str

render object value fully

(int) num: 12
(sfs_object) obj: 
    (bool) what: false

tokenize

get only object structure

{
 "num": "int",
 "obj": {
  "what": bool
 }
}