Flexibilization of ATG object creation

[JoFrhwld]

This PR flexibilizes the creation of aligned_textgrid objects in a number of ways.

AlignedTextGrid

The first position argument to AlignedTextGrid() can now be one of

• A str representing a path to a textgrid.
• A pathlib:Path to a textgrid
• A praatio.textgrid.Textgrid

The original textgrid_path argument can still be utilized without breaking previous code.

SequenceInterval and SequencePoint

The first argument to both SequenceInterval and SequencePoint can now also be a list or tuple of the relevant time and label information. e.g.

seq_int = SequenceInterval((0, 1, "a"))
seq_point = SequencePoint((0, "a"))

SequenceTier and SequencePointTier

These can now also be passed lists of SequenceInterval and SequencePoint, as appropriate, or another tier of its own class.

[codecov]

Codecov Report

Attention: Patch coverage is 94.89796% with 5 lines in your changes missing coverage. Please review.

Project coverage is 90.70%. Comparing base (4c9a41c) to head (0cc7eb1).

Files	Patch %	Lines
src/aligned_textgrid/points/tiers.py	86.95%	3 Missing ⚠️
src/aligned_textgrid/sequences/sequences.py	96.00%	1 Missing ⚠️
src/aligned_textgrid/sequences/tiers.py	95.45%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##              dev     #191      +/-   ##
==========================================
+ Coverage   90.44%   90.70%   +0.25%     
==========================================
  Files          14       14              
  Lines        1361     1431      +70     
==========================================
+ Hits         1231     1298      +67     
- Misses        130      133       +3     

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