New:
* 🐩 Whitelist a range with ` nomut: on` and ` nomut: off`
* 🐩 Whitelist a range with ` nomut: start` and ` nomut: stop`
Fixes:
* 🛠️ Stop Number Mutator from mutating True and False
* 🛠️ In Operator Mutators, only replace bitwise-or with bitwise-and and vice versa.
* 🔧 fix logic in `get_cmd_line_echo_enabled`
* 🔧 fix text on help page
Other:
* 🧪 Added test coverage
* 🔀 Refactoring