`\b` only asserts a boundary next to a word character, so text rules like
`P@ssw0rd!` never matched anything. Now it is only added to the sides where
the value itself begins or ends with a word character.
The SecureValuesPreprocessor has been moved directly to the @appum/logger module and set as a private logger instance property.
The loadSecureValuesPreprocessingRules method is now public instance method of the Logger class. Unit tests were ported to the @appium/logger module as well.