chore(devel): merge flake8 and yapf config into setup.cfg

.flake8

@@ -1,18 +1,3 @@
 [flake8]
-ignore = D103, D107, W503
-max-line-length = 99
-inline-quotes = double
-exclude =
-    .git
-    .tox
-    __pycache__
-    build
-    dist
-    test
-    *.pyc
-    *.egg-info
-    .cache
-    .eggs
-    env*
-application-import-names = dockertidy
-format = ${cyan}%(path)s:%(row)d:%(col)d${reset}: ${red_bold}%(code)s${reset} %(text)s
+# Requires `flake8-colors`. This is the formatting suggested by the package (and used in flake8 repository itself).
+format = ${cyan}%(path)s${reset}:${yellow_bold}%(row)d${reset}:${green_bold}%(col)d${reset}: ${red_bold}%(code)s${reset} %(text)s

.style.yapf

@@ -1,6 +0,0 @@
-[style]
-based_on_style = google
-column_limit = 99
-dedent_closing_brackets = true
-coalesce_brackets = true
-split_before_logical_operator = true

setup.cfg

@@ -0,0 +1,24 @@
+[flake8]
+# Explanation of errors
+#
+# D102: Missing docstring in public method
+# D103: Missing docstring in public function
+# D107: Missing docstring in __init__
+# D202: No blank lines allowed after function docstring
+# W503:Line break occurred before a binary operator
+ignore = D102, D103, D107, D202, W503
+max-line-length = 99
+inline-quotes = double
+exclude = .git, __pycache__, build, dist, test, *.pyc, *.egg-info, .cache, .eggs, env*
+# NOTE: The format for flake8 output is set in the `.flake8` file. This is separate
+#       because `setup.cfg` is parsed on setup, but it would require flake8-colors
+#       to run successfully (which will only be available after install). So we define
+#       it in `.flake8`, and it seems to successfully combine the settings in the
+#       two files together.
+
+[yapf]
+based_on_style = google
+column_limit = 99
+dedent_closing_brackets = true
+coalesce_brackets = true
+split_before_logical_operator = true