• Fix CTRL + J key combination. This used to return an ENTER event.
• Add a generic implementation Command for &T: Command. This allows commands to be queued by reference, as well as by value.
• Remove unnecessary Clone trait bounds from StyledContent.
• Add StyledContent::style_mut.
• Handle error correctly for execute! and queue!.
• Fix minor syntax bug in execute! and queue!.
• Change ContentStyle::apply to take self by value instead of reference, to prevent an unnecessary extra clone.
• Added basic trait implementations (Debug, Clone, Copy, etc) to all of the command structs
• ResetColor uses &'static str instead of String