Add Linux Shell History Manipulation and Persistence Modules

[ForensicITGuy]

Pull Request (PR) Checklist

• [x] I have read the CONTRIBUTING doc
• [x] PR is from a topic/feature/bugfix branch off the dev branch (right side)
• [x] PR is against the dev branch (left side)
• [ ] Merlin compiles without errors
• [ ] Passes linting checks and unit tests
• [ ] Updated CHANGELOG
• [x] Updated README documentation (if applicable)
• [x] Update Merlin version number in pkg/merlin.go (if applicable)

Change Type

• [x] Addition
• [ ] Bugfix
• [ ] Modification
• [ ] Removal
• [ ] Security

Description

Adding modules to clear and prevent saving shell history in Linux.

Also adding modules to set crontab and shell profile persistence in Linux.

Would love a second set of eyes to look at these modules, I'm having trouble with them. Some of them don't seem to like the JSON variables. I've executed the commands manually wrapped in a sh -c and they work but translating into JSON set down some stumbling blocks.