Linting/formatting improvements

[gsingh93]

• Run isort, black, and flake8 on the entire root directory
• Ignore F403 for lines where we do from capstone import * and remove F403 from the ignore list. This way we won't introduce wildcard imports in the future, but don't have to deal with changing any of the capstone code.
• Remove a bunch of warnings/errors from the ignore list in setup.cfg that required no code changes, and some other minor cleanup.

[codecov-commenter]

Codecov Report

Merging #1138 (5b4a1d8) into dev (bf37c03) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##              dev    #1138   +/-   ##
=======================================
  Coverage   50.24%   50.24%           
=======================================
  Files         172      172           
  Lines       19877    19878    +1     
  Branches     1813     1813           
=======================================
+ Hits         9987     9988    +1     
  Misses       9553     9553           
  Partials      337      337           

Impacted Files	Coverage Δ
pytests_collect.py	0.00% <ø> (ø)
gdbinit.py	33.33% <100.00%> (+1.62%)	⬆️
pwndbg/commands/nearpc.py	86.88% <100.00%> (ø)
pwndbg/disasm/__init__.py	54.10% <100.00%> (ø)
pwndbg/disasm/arch.py	66.16% <100.00%> (ø)
pwndbg/disasm/arm.py	32.35% <100.00%> (ø)
pwndbg/disasm/x86.py	62.10% <100.00%> (ø)
pytests_launcher.py	66.66% <100.00%> (ø)

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