Removed screen flicker when entering TUI command screen #71
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Partially fixed #67.
When hiding watchbind's TUI in order for the child/command TUI to execute and draw its own TUI, we previously tore-down watchbind's entire TUI, leading the UI to return to the user's terminal for a split second before drawing the child's/command's TUI. Now, we don't completely unpaint watchbind's TUI and return to the user's terminal, and instead just let the child TUI draw over our (now blank) TUI.
Unfortunately, this "trick" only works when hiding watchbind's TUI and showing the child's TUI, but not when the child's TUI exits and we need to restore/show watchbind's TUI, because we don't control the child's TUI in any way. If we find a solution to the second problem at some point in the future, we'll create a new PR for that.