Add Token Mystification Hook

[7H3LaughingMan]

• Please check if the PR fulfills these requirements

• [x] We use semantic versioning (https://github.com/semantic-release/semantic-release to be specific), so follow https://github.com/angular/angular.js/blob/master/DEVELOPERS.md#-git-commit-guidelines.)

• [x] Docs have been added / updated (for bug fixes / features)

• What kind of change does this PR introduce? (Bug fix, feature, docs update, ...) New Feature

• What is the current behavior? (You can also link to an open issue here) When a token is created it will be mystified based on the module settings and if a key is pressed if setup to require a key to be pressed.

• What is the new behavior (if this is a feature change)? Adds a hook that allows other modules to determine if the token should be mystified or not. The allows other modules like PF2e Bestiary Tracking to determine if a token should not be mystified because the party knows the name of the creature.

• Does this PR introduce a breaking change? (What changes might users need to make in their application due to this PR?) No

• Other information: Addresses #1438

[github-actions[bot]]

:tada: This issue has been resolved in version 6.8.0 :tada:

The release is available on GitHub release

Your semantic-release bot :package::rocket: