Add partial grawlix option

[JasonPierce]

Presently, the censor method replaces the entire profane word with a grawlix. Thought it might be cool to add an option that only replaces the vowels in a profane word.

Acceptance Criteria

1. Add optional usePartialGrawlix param to the censor method. Default to false.
2. Add partialGrawlix option to ProfanityOptions. Defaults to '*'.
3. When usePartialGrawlix is true, instead of the entire profane word being replaced with the grawlix, only the vowels are replaced within the profane word. Each vowel is replaced with the partialGrawlix value.
4. Update readme Options section.

Example

Configure

import { Profanity, ProfanityOptions } from '@2toad/profanity';

const options = new ProfanityOptions();
options.partialGrawlix = '*';

const profanity = new Profanity(options);

Usage

profanity.censor('I like big butts (aka arses) and I cannot lie', true);
// I like big b*tts (aka *rs*s) and I cannot lie

[JasonPierce]

A better solution might be to replace the userPartialGrawlix param with grawlixReplacementType, which supports the following values

• all: this is the current functionality, and would remain the default.
• firstChar: the first char of the profane word is replaced with the grawlixChar
• firstVowel: the first vowel in the profane word is replaced with the grawlixChar
• allVowels: all vowels in the profane word are replaced with the grawlixChar. This would implement the functionality of this ticket's original design

The grawlixChar option would replace the partialGrawlix option, in this design. 🤔

[JasonPierce]

I went with slightly different implementation than the original vision I had for this new feature:

A new, optional, CensorType param has been added to the censor function:

• Word: this is the default functionality of the censor function when no CensorType is specified. This option matches the original functionality of the lib (i.e., before this feature was implemented)
• FirstChar: the first char of the profane word is replaced with the ProfanityOptions.grawlixChar
• FirstVowel: the first vowel in the profane word is replaced with the ProfanityOptions.grawlixChar
• AllVowels: all vowels in the profane word are replaced with the ProfanityOptions.grawlixChar

A new ProfanityOptions.grawlixChar option has been added, which defaults to *