Improve environment recognition

[ppizarror]

• Added environment recognition.
• Added line numbers and text sliders.
• Added \def parsing.
• Added tab and shift-tab support.
• Fix copy from output text while using the menu.
• Improve support for itemizes.
• Improve GUI settings, update window sizes.
• Improve tests.

[codecov[bot]]

Codecov Report

Merging #20 (26d9ac3) into master (4e75fd4) will increase coverage by 0.71%. The diff coverage is 98.61%.

@@            Coverage Diff             @@
##           master      #20      +/-   ##
==========================================
+ Coverage   97.41%   98.13%   +0.71%     
==========================================
  Files          10       10              
  Lines        1393     1551     +158     
==========================================
+ Hits         1357     1522     +165     
+ Misses         36       29       -7     

Impacted Files	Coverage Δ
pydetex/_fonts.py	100.00% <ø> (ø)
pydetex/_symbols.py	100.00% <ø> (ø)
pydetex/_utils_lang.py	95.89% <ø> (ø)
pydetex/_utils_tex.py	99.26% <92.85%> (-0.21%)	:arrow_down:
pydetex/__init__.py	100.00% <100.00%> (ø)
pydetex/_gui_settings.py	90.41% <100.00%> (+0.29%)	:arrow_up:
pydetex/parsers.py	99.84% <100.00%> (+1.52%)	:arrow_up:
pydetex/pipelines.py	100.00% <100.00%> (ø)
pydetex/version.py	88.88% <100.00%> (ø)
... and 1 more

---

Continue to review full report at Codecov.

Legend - Click here to learn more Δ = absolute <relative> (impact), ø = not affected, ? = missing data Powered by Codecov. Last update 4e75fd4...26d9ac3. Read the comment docs.

[lgtm-com[bot]]

This pull request introduces 1 alert when merging c66976ad2edc81617a11c67953afd91e369cb4ea into 4e75fd462cc9eaa9b7426267e8cbefe130bcb9cf - view on LGTM.com

new alerts:

• 1 for Unused local variable