Name the files for what they act on

The names for the config files aren't particularly obvious to everyone.

Details

1. What each file acts on isn't obvious (some act on the dictionary, some on file content, some on the results of the spell checker, some on the resulting comment)
2. The file format for each file isn't obvious (and it varies significantly)

Status

This is a proposal, I'm still playing with it.

File formats

Kind	Current	Proposed
Single word-per line	txt	words
Perl Regular Expression	txt	patterns
GitHub Markdown	txt	md

Overview of changes

Category	Task	Format	Current	Proposed
Dictionary	Replace base dictionary	words	dictionary	dictionary
Dictionary	Add items to dictionary	words	allow	dictionary_additions
Dictionary	Remove items from dictionary	patterns	reject	dictionary_removals
Files	Ignore files	patterns	excludes	file_ignore
Files	Limit file checking	patterns	only	file_exclusive
Content	Mask file content	patterns	patterns	line_masks
Content	Forbidden patterns	patterns	line_forbidden	line_objections
Output	Acknowledge some word-like things that aren't in the dictionary	words	expect	word_expectations
Output	Help users respond to the bot	md	advice	?

Raised in https://github.com/check-spelling/check-spelling/issues/10

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