Added label variable for graphing

[jaredmlobo]

_label variable added to State class. Can be assigned upon creation of a State, or through either the add_state or add_process functions.

• [ ] Fixes # .
• [ ] 2 Tests added
• [ ] Added entry into CHANGELOG.md

Changes proposed in this pull request:

• added _label to state class, which can be assigned upon creation of a State object
• can also be assigned through the add_state or add_process plotting functions
• on all graphs containing the state the representative point is then labeled with the assigned value (either an int or str)

[codecov[bot]]

Codecov Report

Merging #33 (552635b) into main (59b860a) will increase coverage by 0.74%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main      #33      +/-   ##
==========================================
+ Coverage   96.04%   96.79%   +0.74%     
==========================================
  Files           4        4              
  Lines         354      374      +20     
  Branches       85       88       +3     
==========================================
+ Hits          340      362      +22     
+ Misses          6        5       -1     
+ Partials        8        7       -1     

Impacted Files	Coverage Δ
src/thermostate/plotting.py	95.00% <100.00%> (+0.12%)	:arrow_up:
src/thermostate/thermostate.py	98.72% <100.00%> (+1.54%)	:arrow_up:

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[jaredmlobo]

Thanks @jaredmlobo! Very close here, just a few small formatting things.

[jaredmlobo]

I hope that covers all the edits you were looking for @bryanwweber. Let me know if there is anything else I can do!