Make Preferences... menu item open config file
Refactor command view to use NSTextView subclass

...for auto-resizing multi-line command
Fix bug in command execution/deactivate.
Improve scrolling for very long commands
Implement message output for command bar
Dismiss command bar with Escape key.
Implement info message type in command view
Update change log
Rename editxt.commandparser.Type to ...Field
Improve Regex command field placeholder
Fix bugs in command placeholder logic
Fix bug in escaping of Regex command field
Restrict Regex field delimiters to / : " '
Refactor Regex command field to not compile regex
editxt.commandbase -> editxt.command.base
editxt.commandparser -> editxt.command.parser
editxt.wraplines -> editxt.command.wraplines
editxt.sortlines -> editxt.command.sortlines
editxt.changeindent -> editxt.command.changeindent
Move utility functions into editxt.command.util