Improve terminal detection (v0.1.5)

[mrz1988]

• Improve package exports
• Add support for NO_COLOR
• Add better detection for Cygwin and git bash on Windows
• Improve some test coverage for terminal detection
• Add a helper for terminal detection that prints some useful output

[codecov-io]

Codecov Report

Merging #47 into master will decrease coverage by 0.05%. The diff coverage is 86.36%.

@@            Coverage Diff             @@
##           master      #47      +/-   ##
==========================================
- Coverage   85.77%   85.72%   -0.06%     
==========================================
  Files          31       31              
  Lines        1666     1695      +29     
  Branches      269      273       +4     
==========================================
+ Hits         1429     1453      +24     
- Misses        206      208       +2     
- Partials       31       34       +3

Impacted Files	Coverage Δ
lilies/terminal/__init__.py	100% <100%> (ø)	:arrow_up:
lilies/compiler/state_manager.py	86.66% <100%> (+0.3%)	:arrow_up:
lilies/terminal/windows.py	100% <100%> (ø)	:arrow_up:
lilies/compiler/__init__.py	100% <100%> (ø)	:arrow_up:
lilies/terminal/detect.py	86.82% <82.35%> (+0.41%)	:arrow_up:
lilies/terminal/ansi256.py	94.69% <0%> (-1.52%)	:arrow_down:

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