[ENH] Sphinx's `exclude_patterns` as ignore patterns

[maxdup]

Hi :) This is an implementation for the feature requested in issue #131

This fork enables sphinx-autobuild's ignore system to leverage sphinx's conf.py. Sphinx's exclude_patterns configuration is now taken into account when determining what files to ignore.

P.S: I know my try statement looks a little paranoid but I feel it's adequate given the circumstances. Anyway, let me know your thoughts.

P.P.S: Sorry I couldn't run the linter ¯_(ツ)_/¯ (but I did run the code through Black)

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