Make improvements to Vocabulary list

[SecondSkoll]

@izmalk made a great suggestion in #79 around making lower case vocabulary entries be captured for upper case usage (for use at the start of sentences). This made me think that plurals are also not accounted for - and terms that can be pluralised should also be captured.

• Edit all lower case vocabulary terms to accept upper case using selective syntax like, e.g. [Uu]ppercase

  • Full case insensitivity can be a bad idea, as it will allow CAPSLOCK/PascalCase/camelCase usage.

• Allow all terms that can be pluralised accept the plural versions as well, e.g. [Nn]namespace(?:s)?

  • It would be ideal to use non-capturing groups for plurals, as it would be best to use common syntax, and they will speed up processing compared to capturing groups.
  • It could also be a good idea to accept other parts of speech as well.