New rule: DisallowedDeclarationName

[a-frantz]

Credit to @adthrasher for the idea proposed in a comment on #133

We have DisallowedInputName and DisallowedOutputName. Those should remain unchanged, but there should be a new rule that checks all Decls (IO and private) for "type prefixes/suffixes". e.g. File gtfffile would be bad and so would Int my_int

[adthrasher]

One consideration (via Mike Rusch), what about something like bcftools annotate (https://samtools.github.io/bcftools/bcftools.html#annotate). It has parameters that can be specified as a string or as a file. So the file suffix might make sense in that case to distinguish.

-r, --regions chr|chr:pos|chr:from-to|chr:from-[,…​]
see [Common Options](https://samtools.github.io/bcftools/bcftools.html#common_options)

-R, --regions-file file
see [Common Options](https://samtools.github.io/bcftools/bcftools.html#common_options)