Change Mutable API

[cgarciae]

Changes

• Previously self.mutable(*args, method=method, **kwargs)
• Is now...... self.mutable(method=method)(*args, **kwargs)
• Opaque API is removed
• inplace argument is now only available for apply.
• Immutable.{mutable, toplevel_mutable} methods are removed.

[codecov-commenter]

Codecov Report

Merging #19 (d5f4eee) into master (a9007a5) will decrease coverage by 0.73%.
The diff coverage is 89.32%.

@@            Coverage Diff             @@
##           master      #19      +/-   ##
==========================================
- Coverage   91.81%   91.08%   -0.74%     
==========================================
  Files           6        6              
  Lines         770      774       +4     
==========================================
- Hits          707      705       -2     
- Misses         63       69       +6     

Impacted Files	Coverage Δ
treeo/types.py	81.03% <ø> (-0.64%)	⬇️
treeo/utils.py	87.05% <ø> (-4.04%)	⬇️
treeo/mixins.py	84.61% <78.57%> (-2.45%)	⬇️
treeo/api.py	91.50% <84.21%> (-0.38%)	⬇️
treeo/tree.py	95.47% <96.00%> (+0.06%)	⬆️
treeo/__init__.py	100.00% <100.00%> (ø)

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