Move helpers to a js2xml.utils submodule

[redapple]

js2xlm.jsonlike is a misleading name for what the submodule provides:

• "jsonlike" here really means: what looks like a Python list or a dict
• make_dict can return more than just a Python dict, e.g. a string or boolean

This very change moves the functionality of js2xml.jsonlike to its own submodule js2xml.utils.objects.

In there, you can still get out Python dicts and lists, but also "simple" JavaScript built-in objects:

• Objects (e.g. {a: 1}) into dict,
• Arrays as list,
• booleans as bool,
• string as str,
• numbers as int or float
• nulls an undefined as None.

You have 3 main methods:

• js2xml.utils.objects.make(node): takes a node in the js-parsed tree and converts to the Python object following the mapping described above,
• js2xml.utils.objects.findall(tree, types): to find the top-most nodes in the js-parsed tree that can be converted to one of these Python types above; you can pass the Python types you want in the types (as a list or tuple). By default it will look for list-like and dict-like objects, but you can pass types=['str'] to search for strings.
• js2xml.utils.objects.getall(tree, types): same as findall except that is converts what was found to the corresponding Python object, using make()

[redapple]

Hey @rolando, I'm introducing a js2xml.utils submodule. Would your helpers in #22 fit?

[codecov-io]

Codecov Report

Merging #26 into master will decrease coverage by 0.11%. The diff coverage is 93.22%.

@@            Coverage Diff             @@
##           master      #26      +/-   ##
==========================================
- Coverage   90.54%   90.43%   -0.12%     
==========================================
  Files           9       10       +1     
  Lines         656      669      +13     
==========================================
+ Hits          594      605      +11     
- Misses         62       64       +2

Impacted Files	Coverage Δ
js2xml/jsonlike.py	100% <100%> (+4.34%)	:arrow_up:
js2xml/utils/objects.py	92.3% <92.3%> (ø)

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[rmax]

@redapple Yes, sounds good to me.