Make our own shell-like environment

[benthayer]

Having our own shell would allow us to see user input, so we could track whether they have run certain commands.

We could track things like:

• git revert
• git reset
• git cherry-pick
• git diff
• git remote
• git config
• touch

Other pros:

• Switch to fake git users when simulating remote interactions
• Set the colors of the terminal, show branching information inline
• Log user commands so they can ask for help (#167)
• Automatically track progress
• Tell the user what to do
• Feels more like a videogame
• Have much more flexibility when creating levels
• Change contents of files on the fly
• Automatically use the newest version of git

Cons:

• Maybe confusing to users
• Probably slow
• Probably buggy
• Definitely time-consuming
• Definitely privacy issues