Normalize how commands work, debugging

[tony]

Restructure how commands are passed in

This will probably be by creating a command factory where the command is built, then an execute() for it. But to the user in a tmux object, .cmd should still execute immediately, _cmd() could leave an object where the user can see the exact command tmux is running before hand.

There should be more options to toggle debug settings

[stale]

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